Patchouli (; Pogostemon cablin), from Tamil paccuḷi, is a species of plant from the family Lamiaceae, commonly called the 'mint' or 'deadnettle' family.  The plant grows as a bushy perennial  herb, with erect stems reaching around 75 centimetres (2.5 ft) in height and bearing small, pale pink-white flowers.  It is native to tropical regions of Asia, and is now extensively cultivated in China, Indonesia, Japan, Cambodia, Myanmar, India, Maldives, Malaysia, Mauritius, Seychelles, Madagascar, Taiwan, ...

pogostemon cablin

The-most-important-thing-about-cancer

The most important thing about cancer

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Cancer is a complex genetic disorder that catalyzes the uncontrolled growth and spread of abnormal cells throughout the body, leading to life-threatening consequences. Aging, differences in lifestyle, genetic factors, hormonal changes and environmental exposure to carcinogens constitute major factors leading to cancer activation in humans. 1

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According to 2020 statistics, cancer is the leading cause of death worldwide, accounting for nearly 10 million deaths in 2020, or nearly one in six deaths. Globally, about 17 million people are diagnosed with cancer each year, and this trend is forecast to intensify dramatically in the near future. About 36 types of cancer have already been identified in humans, and a significant association between sex and type of cancer has been observed. Men are usually more prone to colorectal cancer, liver, lung, prostate and stomach cancers, while women suffer more from breast, cervical cancer, colorectal cancer, lung and thyroid cancer. 2&nbsp;

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In general, the development of cancer can be divided into three stages:

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<ul><li style="font-weight: 400;" aria-level="1">Initiation in which exposure to a carcinogen induces DNA damage and mutations at the cellular level due to damage/error in DNA repair mechanisms;&nbsp;</li><li style="font-weight: 400;" aria-level="1">Initiation in which cell expansion leads to hyper proliferation, modification and inflammation of cells/tissues;&nbsp;</li><li style="font-weight: 400;" aria-level="1">Progression in which tumor formation occurs from preneoplastic cells by clonal expansion. 3</li></ul>DNA damage causes genomic instability, which is a major cause of cancer 4. Although some of the conventional methods such as chemotherapy, radiation therapy and surgery are effective in treating cancer, they can lead to major side effects and toxicity.

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Given the lack of effective and safe approaches, as well as the complexity of cancers, the development of new and natural chemotherapeutic agents is strongly needed. In this respect, the pharmacological properties of certain essential oils may be available therapies to suppress cancer. 5

Essential-oils:-general-information-and-biological-effects

Essential oils: general information and biological effects

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The discovery of natural plant-based products is rightly recognized as a milestone in the history of healthcare, and their introduction to the market in combination with synthetic drugs helps to lead favorably in various health problems. As a result, the extraction of plant secondary metabolites, such as essential oils by steam or hydrodistillation processes, has made significant progress over the years. Stored in oil/resinous ducts, glands or trichomes of plants, these essential oils play an important role in protecting against extraneous agents and are involved in signal transduction pathways.&nbsp;

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Essential oils are a complex mixture of various chemical compounds, mainly characterized by volatility, aroma, low molecular weight and density. The diverse biological properties of essential oils stem from differences in their chemical composition and structure. At present, three main classes of components in essential oils have been identified, namely terpenes and terpenoids (with major contributions), phenols and aliphatic compounds.&nbsp;&nbsp;

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The data from the study on which this article is based are focused on studies dealing only with in vitro (non-living test)/in vivo (live testing) anticancer activities of essential oils in general. The analysis in Scopus was carried out for the last 10 years (2011–2020) on September 14, 2021, so the information is up to date as of that date.

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Essential oils are cytotoxic in nature

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Essential oils cause programmed cell death of cancer cells through apoptosis, necrosis, cell cycle arrest, and dysfunction of major cellular organelles. This is coordinated by an increase in membrane fluidity of the affected cell, decreased generation of adenosine triphosphate (ATP), a change in the pH gradient and loss of mitochondrial potential, which are the main precursors of cell death. All three main types of chemical components in oils, i.e. phenols, aldehydes and alcohols, have been described to fulfil this function.

Essential-oils-such-as-antimutagenic-and-antiproliferative-agents

Essential oils such as antimutagenic and antiproliferative agents

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Antioxidants are defined as compounds that can inhibit/slow the oxidation of free radicals when used in small amounts. Antioxidant action is one of the key biological properties of essential oils to cope with oxidative stress. For example, under in vivo conditions, increasing the activity of various antioxidant enzymes and oxidized glutathione from the components of the oil of Wedelia chinensis (Osbeck) Merr.&nbsp; provides protection against lung cancer in mice. 6

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With regard to the antimutagenic activity of essential oils, cancer can be inhibited by preventing the direct penetration of mutagens into the cell membrane, inactivating mutagens by direct clearance, trapping free radicals produced by mutagens, inhibiting the conversion of promutagens to mutagens by cytochrome P450 enzyme, enzymatic detoxification of mutagens, and efficient error-free DNA repair.&nbsp;

Antiproliferative-activity-of-essential-oils

Antiproliferative activity of essential oils

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Essential oils can exert an antiproliferative effect through multiple mechanisms, including cell membrane disruption (depolarization, increase in membrane permeability, or decrease in the activity of membrane-bound enzymes) and induction of apoptosis. 7

Essential-oils-and-their-constituents-in-different-cancer-cell-lines

Essential oils and their constituents in different cancer cell lines 

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Over the past few years, the chemoprevention of cancer using essential oils or their components has attracted a lot of attention among the scientific community. Many in vitro/in vivo studies have highlighted the anticancer activity of oils and, more precisely, their main constituents in various tumour cell lines. Next, we will look at who they are and in which types of cancer they can have the necessary effect.

Essential-oils-for-breast-cancer

Essential oils for breast cancer

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<ul><li style="font-weight: 400;" aria-level="1">Silver fir (Abies alba Mill.)</li><li style="font-weight: 400;" aria-level="1">Abies koreana (Pinaceae)&nbsp;</li><li style="font-weight: 400;" aria-level="1">Boswellia sacra (Burseraceae)&nbsp;</li><li style="font-weight: 400;" aria-level="1">Casearia sylvestris Sw. (Salicaceae/Flacourtiaceae)&nbsp;</li><li style="font-weight: 400;" aria-level="1">Cyperus articulatus L. (Cyperaceae)</li><li style="font-weight: 400;" aria-level="1">Garcinia atroviridis Griff. (Clusiaceae)</li><li style="font-weight: 400;" aria-level="1">Garcinia celebica L. (Clusiaceae)</li><li style="font-weight: 400;" aria-level="1">Glandora rosmarinifolia (Boraginaceae)</li><li style="font-weight: 400;" aria-level="1">Helichrysum gymnocephalum (Asteraceae)</li><li style="font-weight: 400;" aria-level="1">Iryanthera polyneura (Myristicaceae)</li><li style="font-weight: 400;" aria-level="1">Liquidambar styraciflua L. (Altingiaceae)</li><li style="font-weight: 400;" aria-level="1">Myristica fragrans. (Myristicaceae)</li><li style="font-weight: 400;" aria-level="1">Pituranthos tortuosus Apiaceae)&nbsp;</li><li style="font-weight: 400;" aria-level="1">Solanum spirale Roxb.&nbsp;</li></ul>

Essential-oils-in-human-breast-cancer

Essential oils in human breast cancer

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<ul><li style="font-weight: 400;" aria-level="1">Cedrelopsis grevei (Rutaceae)&nbsp;</li><li style="font-weight: 400;" aria-level="1">Melaleuca armillaris(Myrtaceae)</li><li style="font-weight: 400;" aria-level="1">Monodora myristica (Annonaceae)</li><li style="font-weight: 400;" aria-level="1">Origanum onites L. (Lamiaceae)</li><li style="font-weight: 400;" aria-level="1">Satureja montana L. subsp. pisidica (Lamiaceae)</li><li style="font-weight: 400;" aria-level="1">Varthemia iphionoides (Asteraceae)</li><li style="font-weight: 400;" aria-level="1">Xylopia aethiopica (Annonaceae)</li></ul>

Essential-oils-in-human-glioblastoma

Essential oils in human glioblastoma

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<ul><li style="font-weight: 400;" aria-level="1">Ageratum conyzoides (L.) L. (Asteraceae)</li><li style="font-weight: 400;" aria-level="1">Drimys angustifolia (Winteraceae)</li><li style="font-weight: 400;" aria-level="1">Drimys brasiliensis (Winteraceae)</li><li style="font-weight: 400;" aria-level="1">Lippia multiflora (Verbenaceae)</li><li style="font-weight: 400;" aria-level="1">Liriodendron tulipifera L. (Magnoliaceae)</li><li style="font-weight: 400;" aria-level="1">Ocimum basilicum L. (Lamiaceae)</li><li style="font-weight: 400;" aria-level="1">Piper cernuum (Piperaceae)</li><li style="font-weight: 400;" aria-level="1">Scorodopholeus zenkeri (Fabaceae)</li><li style="font-weight: 400;" aria-level="1">Zingiber officinale (Zingiberaceae)</li></ul>

Essential-oils-in-human-colon-carcinoma

Essential oils in human colon carcinoma

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<ul><li style="font-weight: 400;" aria-level="1">Afrostyrax lepidophyllus Mildbr. (Huaceae)</li><li style="font-weight: 400;" aria-level="1">Artemisia campestris L. (Asteraceae)&nbsp;</li><li style="font-weight: 400;" aria-level="1">Athanasia brownii Hochr. (Asteraceae)</li><li style="font-weight: 400;" aria-level="1">Liriodendron tulipifera L. (Magnoliaceae)</li><li style="font-weight: 400;" aria-level="1">Pistacia lentiscus L. (Anacardiaceae)</li><li style="font-weight: 400;" aria-level="1">Scorodopholeus zenkeri (Fabaceae)</li></ul>

Essential-oils-in-human-mammary-adenocarcinoma

Essential oils in human mammary adenocarcinoma

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<ul><li style="font-weight: 400;" aria-level="1">Athanasia brownii (Asteraceae)</li><li style="font-weight: 400;" aria-level="1">Liriodendron tulipifera L. (Magnoliaceae)</li><li style="font-weight: 400;" aria-level="1">Nepeta ucranica L. spp. (Lamiaceae)</li><li style="font-weight: 400;" aria-level="1">Populus alba L. (Salicaceae)</li><li style="font-weight: 400;" aria-level="1">Rosmarinus officinalis L. (Lamiaceae)</li><li style="font-weight: 400;" aria-level="1">Scorodopholeus zenkeri (Fabaceae)</li></ul>

<ul><li style="font-weight: 400;" aria-level="1">Afrostyrax lepidophyllus. (Huaceae)&nbsp;</li><li style="font-weight: 400;" aria-level="1">Ageratum conyzoides (L.) L. (Asteraceae)</li><li style="font-weight: 400;" aria-level="1">Drimys angustifolia (Winteraceae)</li><li style="font-weight: 400;" aria-level="1">Lippia multiflora (Verbenaceae)</li><li style="font-weight: 400;" aria-level="1">Liriodendron tulipifera L. (Magnoliaceae)</li><li style="font-weight: 400;" aria-level="1">Ocimum basilicum L. (Lamiaceae)</li><li style="font-weight: 400;" aria-level="1">Piper cernuum (Piperaceae)</li><li style="font-weight: 400;" aria-level="1">Scorodopholeus zenkeri (Fabaceae)</li><li style="font-weight: 400;" aria-level="1">Zingiber officinale (Zingiberaceae)</li></ul>

Essential-oils-for-prostate-cancer

Essential oils for prostate cancer

Essential-oils-for-prostate-cancer_5_0

<ul><li style="font-weight: 400;" aria-level="1">Ageratum conyzoides (L.) (Asteraceae)</li><li style="font-weight: 400;" aria-level="1">Bursera glabrifolia (Burseraceae)&nbsp;</li><li style="font-weight: 400;" aria-level="1">Curcuma aromatica (Zingiberaceae)</li><li style="font-weight: 400;" aria-level="1">Cymbopogon citratus (Poaceae)</li><li style="font-weight: 400;" aria-level="1">Cymbopogon giganteus. (Poaceae)</li><li style="font-weight: 400;" aria-level="1">Iryanthera polyneura (Myristicaceae)</li><li style="font-weight: 400;" aria-level="1">Lavandula angustifolia (Lamiaceae)</li><li style="font-weight: 400;" aria-level="1">Lippia multiflora (Verbenaceae)</li><li style="font-weight: 400;" aria-level="1">Ocimum basilicum L. (Lamiaceae)</li><li style="font-weight: 400;" aria-level="1">Varthemia iphionoides (Asteraceae)</li><li style="font-weight: 400;" aria-level="1">Zingiber officinale (Zingiberaceae)</li></ul>

Essential-oils-for-colorectal-cancer

Essential oils for colorectal cancer

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<ul><li style="font-weight: 400;" aria-level="1">Aquilaria crassna (Thymelaeaceae)</li><li style="font-weight: 400;" aria-level="1">Eucalyptus camaldulensis. (Myrtaceae)</li><li style="font-weight: 400;" aria-level="1">Thymus fallax (Lamiaceae)</li></ul>&nbsp;

Essential-oils-in-acute-lymphoblastic-leukemia

Essential oils in acute lymphoblastic leukemia

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<ul><li style="font-weight: 400;" aria-level="1">Juniperus excela (Cupressaceae)</li><li style="font-weight: 400;" aria-level="1">Juniperus oxycedrus L. (Cupressaceae)&nbsp;</li><li style="font-weight: 400;" aria-level="1">Pinus pinea L. (Pinaceae)&nbsp;</li><li style="font-weight: 400;" aria-level="1">Cedrus libani (Pinaceae)&nbsp;</li></ul>

Essential-oils-for-lung-cancer

Essential oils for lung cancer

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<ul><li style="font-weight: 400;" aria-level="1">Artemisia indica (Asteraceae)</li><li style="font-weight: 400;" aria-level="1">Curcuma aromatica (Zingiberaceae)&nbsp;</li><li style="font-weight: 400;" aria-level="1">Eucalyptus globulus(Myrtaceae)</li><li style="font-weight: 400;" aria-level="1">Pluchea dioscoridis L. (Asteraceae)</li><li style="font-weight: 400;" aria-level="1">Populus alba L. (Salicaceae)</li><li style="font-weight: 400;" aria-level="1">Rosmarinus officinalis L. (Lamiaceae)</li><li style="font-weight: 400;" aria-level="1">Zingiber striolatum (Zingiberaceae)</li></ul>

Essential-oils-for-liver-cancer

Essential oils for liver cancer

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<ul><li style="font-weight: 400;" aria-level="1">Pituranthos tortuosus (Apiaceae)</li><li style="font-weight: 400;" aria-level="1">Artemisia indica (Asteraceae)&nbsp;</li></ul>

Essential-oils-in-melanoma

Essential oils in melanoma

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<ul><li style="font-weight: 400;" aria-level="1">Afrostyrax lepidophyllus (Huaceae)&nbsp;</li><li style="font-weight: 400;" aria-level="1">Athanasia brownii (Asteraceae)</li><li style="font-weight: 400;" aria-level="1">Casearia sylvestris&nbsp; (Salicaceae/Flacourtiaceae)</li><li style="font-weight: 400;" aria-level="1">Curcuma aromatica (Zingiberaceae)</li><li style="font-weight: 400;" aria-level="1">Guatteria friesiana (Annonaceae)</li><li style="font-weight: 400;" aria-level="1">Liriodendron tulipifera L. (Magnoliaceae)</li><li style="font-weight: 400;" aria-level="1">Myristica fragrans (Myristicaceae)</li><li style="font-weight: 400;" aria-level="1">Neolitsea variabillima (Lauraceae)</li><li style="font-weight: 400;" aria-level="1">Ocimum basilicum L. (Lamiaceae)</li><li style="font-weight: 400;" aria-level="1">Origanum onites L. (Lamiaceae)</li><li style="font-weight: 400;" aria-level="1">Salvia officinalis L. (Lamiaceae)</li><li style="font-weight: 400;" aria-level="1">Pituranthos tortuosus (Apiaceae)</li></ul>

Essential-oils-for-ovarian-adenocarcinoma

Essential oils for ovarian adenocarcinoma

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<ul><li style="font-weight: 400;" aria-level="1">Mentha villosa Huds. (Lamiaceae)&nbsp;</li><li style="font-weight: 400;" aria-level="1">Xylopia frutescens Aubl. (Annonaceae)&nbsp;</li><li style="font-weight: 400;" aria-level="1">Guatteria pogonopus Mart. (Annonaceae)</li></ul>

Anticancer-effect-of-the-main-ingredients-of-essential-oils

Anticancer effect of the main ingredients of essential oils

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D-limonene, monoterpene in the fruit peels of citrus essential oils (90–95%) exhibits cytotoxicity against stomach cancer, hepatocellular carcinoma, colon cancer, bladder cancer, and melanoma. Similarly, carvacrol (phenolic monoterpenoid) can inhibit tumor growth in stomach cancer cells by increasing apoptotic proteins such as Bax (Bcl-2-linked X protein, apoptosis regulator) and caspases with concomitant reduction of Bcl-2 (B -cell lymphoma 2) expression. Citral showed antitumor effects in various cancer cell lines such as MDA-MB-231, Ishikawa, ECC-1, LNCaP, PC-3, SF-767, SF-763, LU134AM, LU135, LU165, MN1112, HCT116, HT-29, AGS, NB4, and A431.

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A combined formula of citral (80 μM) and curcumin (40 μM) also acts synergistically in suppressing the growth of breast cancer cell lines MCF-7 and MDA-MB-231 by inducing apoptosis, DNA damage and cell cycle arrest in the G0/ G1 phase. In vitro/in vivo cytotoxic potential of citronellol has been reported against human non-small cell lung cancer (NSCLC), breast cancer, and prostate cancer. Citronellol induced cell cycle arrest in NCI-H1299 (NSCLC cell line) due to the increased expression of cyclins (cyclin D and E) and CDK2 (cyclin-dependent kinase 2). There was a decrease in tumour volume in mice treated with increasing doses of citronellol (12.5, 25 and 50 mg kg-1). An antiproliferative effect of geraniol (monoterpenoid) was observed in cells A549 (IC50 = 797.2 μM) and tumor growth was suppressed in mice (at 50 and 75 mmol geraniol kg-1 food) due to apoptosis and cell death.

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Globularifolin iridoid exhibits cytotoxicity against U87 glioma cells due to an increase in the number of apoptotic cells, cell cycle arrest, and inhibition of cancer cell migration and invasion.

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In vitro cytotoxicity of quinocitiol (tropolone monoterpenoid) was observed (at 10 μM) in mouse melanoma cells (B16-F10); However, under in vivo conditions, mice treated with 10–20 μg michi-1 quinokitiol showed a decrease in tumor nodules. Increased expression of p53 (tumor suppressor), Bax, caspases, cytochrome c, and MAPK (mitogen-activated protein kinase) phosphatase-3 and downregulation of survivin (apoptosis inhibitor), MMPs, and phosphorylation of ERK has been reported to induce apoptosis in quinocitiol A549 and B16-F10-treated cells.&nbsp;

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Similarly, treatment with linalool (monoterpene alcohol) reduces proliferation and cell viability in colorectal cancer, colon carcinoma, hepatocarcinoma, epidermoid carcinoma and prostate cancer. Diallyl disulfide (DADS), one of the main components of garlic essential oil, stops the division of human esophageal squamous cell cancer cells in the G2/M phase of the cell cycle. Myristicin, an active component of nutmeg oil (Myristica fragrans), exhibits cytotoxic activity by inducing apoptosis of K562 human leukemia cells.

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Other constituents of essential oils, such as bacuiol (monoterpene), myrtenal (bicyclic monoterpene), oleuropein (secoiridoid), perylyl alcohol (menthane monoterpene), thymol (monocyclic phenolic monoterpene), α-bisabolol (monocyclic sesquiterpene alcohol), α-thujone (ketone monoterpene), camphene (bicyclic monoterpene), iatammanwaltrate P (iridoid ester), eugenol (phenylpropanoid), germakren D (sesquiterpene), nymbolide (terpenoid lactone), patchouli alcohol (sesquiterpene alcohol), α-Santalol (sesquiterpene), carveol (monocyclic monoterpenoid alcohol), carvone (monoterpene), isopulegol (monoterpene alcohol),&nbsp;&nbsp; β-caryophyllene oxide (bicyclic sesquiterpene) and β-elemen (sesquiterpenoid oxide)&nbsp; have also been reported as cytotoxic and antiproliferative compounds with anticancer effects.

It has been found that various essential oils possess countless biological activities and beneficial components that can affect the development of various forms of cancer. These essential oil constituents contribute to the potential anticancer, antitumor, and antiproliferative properties of essential oils. They are specific to each type of plant and can be the basis of anticancer therapy, as well as used in the form of liposomes/nanoemulsions/nanoparticles against various types of cancer.

Anti-cancer properties of essential oils and their components

Бетина Цветкова

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Author: Rositsa Tashkova, Master of Molecular Biology and Microbiology

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Nothing spoils the mood in spring and summer as annoying biting insects - which seem to fly on swarms to draw on our blood. However, itching is our smallest problem - mosquitoes and ticks are insidious in that they transmit dangerous diseases.

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Ticks carry the following dangerous (deadly) diseases:

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<ul>
<li style="font-weight: 400;" aria-level="1">Lyme disease;</li>
<li style="font-weight: 400;" aria-level="1">Tick encephalitis;</li>
<li style="font-weight: 400;" aria-level="1">Q-fever;</li>
<li style="font-weight: 400;" aria-level="1">Hemorrhagic fever with kidney syndrome;</li>
<li style="font-weight: 400;" aria-level="1">Crimean-Congo hemorrhagic fever;</li>
<li style="font-weight: 400;" aria-level="1">Marseilles fever and others.</li>
</ul>

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Mosquitoes carry very dangerous diseases such as:

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<ul>
<li style="font-weight: 400;" aria-level="1">Malaria;</li>
<li style="font-weight: 400;" aria-level="1">West Nile fever;</li>
<li style="font-weight: 400;" aria-level="1">Dengue;</li>
<li style="font-weight: 400;" aria-level="1">Yellow fever.</li>
</ul>

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Among the most effective repellents against these insects are chemical ones containing the substances DEET (N,N-diethyl-3-methylbenzamide, formerly known as N,N-diethyl-m-toluamide) or icaridin (picaridin), but they are not always suitable for use.

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DEET may show neurotoxicity in its use in combination with sunscreen and is not recommended in pregnant women unless it is extremely necessary and the risks of infection are greater than the risk of the chemical's effects on the foetus. It cannot be used in children under 2 years of age.

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Plant-based repellents are the alternative to chemical repellents (although their action, of course, is also due to chemicals ;) ). In the following lines we will consider which plants and substances from them offer protection against mosquitoes, ticks, and in some cases flies and biting midges. [<a href="https://www.bioseek.eu/en/eng/research/pubmed/Chemical_and_Plant_Based_Insect_Repellents_Efficacy_Safety_and_Toxicity_26827259" target="_blank" rel="noopener">ref.1</a>]

Lemon-scented-Gum-Tree-or-Lemon-Eucalyptus-Oil

Lemon-scented Gum Tree or Lemon Eucalyptus Oil

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The effect of lemon eucalyptus (Corymbia citriodora or Eucalyptus citriodora) is due to the substance p-mint-3,8-diol. It offers good protection against mosquitoes and ticks, which lasts up to 2 hours, protecting better from ticks compared to DEET. Also protects against biting midges.

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At home, a mixture of 1 part lemon eucalyptus oil and 10 parts of sunflower oil can be prepared. Apply as a spray.

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Not suitable for children under 3 years and sufferers of atopic dermatitis.

Permethrin

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The substance is derived from crushed dried colors of Dalmatian chrysanthemum (Chrysanthemum cinerarifolium). It is highly effective against mosquitoes, ticks, fleas and biting midges, but it is applied to clothes, nets, sleeping bags, and not on the skin. It does not damage the fabrics of clothes and plastics. It is necessary to re-apply it only after 5-10 or more laundry cycles.

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It is even more effective when used in combination with other repellents that are put on the skin. In direct contact, it causes insect paralysis, leading to its death.

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Unfortunately, mosquito resistance to permethrin has been observed in recent years.

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Citronella

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It is extracted from lemongrass (Cymbopogon spp.) and offers weak protection only against mosquitoes for up to 2 hours. Its activity is due to the substance 3,7-dimethyloct-6-en-1-al. It is used in the form of candles, oil or lotion.

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It can damage clothes and cause irritation on the skin, eyes or cause an allergy.

Essential-Oils

Essential Oils

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The most effective essential oils against mosquitoes are [ <a href="https://www.bioseek.eu/en/eng/research/pubmed/Plant_based_insect_repellents_a_review_of_their_efficacy_development_and_testing_21411012" target="_blank" rel="noopener">ref.2</a>]:

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<ul>
<li style="font-weight: 400;" aria-level="1">thyme oil (Thymus vulgaris),</li>
<li style="font-weight: 400;" aria-level="1">geraniol,</li>
<li style="font-weight: 400;" aria-level="1">mint oil</li>
<li style="font-weight: 400;" aria-level="1">cedar oil,</li>
<li style="font-weight: 400;" aria-level="1">patchouli (Pogostemon cablin),</li>
<li style="font-weight: 400;" aria-level="1">cloves (Syzygium aromaticum).</li>
</ul>

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Their activity varies between 60 and 180 minutes, since most of these essential oils are highly volatile and soon evaporate. This problem can be solved by using fixatives or careful formulation to improve durability.

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It should be considered that essential oils can irritate the skin and their repellent effect is variable depending on the formulation and concentration. The combination of essential oil and sun can lead to further irritation of the skin. Essential oils are never used directly on the skin undiluted, but always in combination with a carrier oil.

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How-To-Relieve-Itching-From-Bites

How To Relieve Itching From Bites

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Besides hydrocortisone cream from the pharmacy or calamine lotion, there are several homemade remedies that you can try to relieve unpleasant itching from bites:

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<ul>
<li style="font-weight: 400;" aria-level="1">Put a piece of raw onions on the site of the bite;</li>
<li style="font-weight: 400;" aria-level="1">Put freshly chopped garlic on the bite;</li>
<li style="font-weight: 400;" aria-level="1">Rub apple cider vinegar on the affected skin;</li>
<li style="font-weight: 400;" aria-level="1">Smear the bite with a paste of baking soda and water;</li>
<li style="font-weight: 400;" aria-level="1">Put on a cold compress;</li>
<li style="font-weight: 400;" aria-level="1">Place a chilled used bag of chamomile tea on the spot;</li>
<li style="font-weight: 400;" aria-level="1">Smear the bite with thyme tea;</li>
<li style="font-weight: 400;" aria-level="1">Smear the bite with a pre-prepared extract of St. John's wort in olive oil.</li>
</ul>

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If nothing helps, just try to focus your attention on something else and avoid scratching, because it will lead to skin damage and potential infection, as well as slower resolution of itching and discomfort.

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Nature offers several effective means to prevent attacks by mosquitoes, ticks and other bloodsuckers carrying severe diseases. However, in areas with a high prevalence of these infections, it is advisable to use chemical repellents such as DEET, which give greater certainty and long-lasting effect. This is especially true when travelling in some more exotic destinations.

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How To Get Rid Of Mosquitoes And Ticks And Stop The Itching With Natural Remedies