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Dihydrotestosteron (DHT)
DHT er et androgent hormon og kan sættes i direkte relation til ansigtshår. Sammen med testosteron, hvilket dihydrotestosteron er syntesiteret fra ved brug af 5-alfa reduktase, er disse to androgene hormener de vigtigste hormoner som et skæg dannes fra.1)2)3)
Uden DHT vil der ikke være noget skæg. Nogle skæggede mænd føler at dette er ukorrekt, på trods af videnskabelige beviser, og vælger at bruge DHT blokader grundet at „DHT fører til hårtab“. Hvad de ikke indser er, at grundet til at disse mænd udvikler skægvækst på trods af brugen af DHT blokerende ingredienser, såsom æteriske olier, er at DHT ikke bliver blokeret - i hvertfald ikke i nogen betydelig grad. Selv hvis en skægget mand føler en positiv udvikling med sig skæg på trods af brugen af DHT blokader, vil dette betyde at han potentielt kunne opleve endnu bedre resultater uden.
Topiske DHT blokader er ikke nær så kraftfulde som orale (recept) blokader, og udgør mindre risiko for fortynding af noget ansigtbehåring. På grund af at der stadig er en risiko, anbefales det dog altid at man holder sig fra potentielle DHT blokader.
DHT Blockers
A DHT blocker is something that inhibits the production of dihydrotestosterone by limiting 5-alpha reductase's (5AR) ability to convert testosterone to DHT. Topical DHT blockers that you apply directly to your skin, such as some essential oils, are not as effective as oral solutions like finasteride and dutasteride.
If you want the best beard growth possible, stay away from DHT-inhibiting oils and foods. Men that naturally have high androgen sensitivity likely will not need to worry as much as those that have more of a struggle to grow a beard, but it is still recommended that all men stay away from DHT blockers.
There is no way, at this moment, to know how much a potential DHT blocker affects one person to the next. Keep in mind that individuals vary, and simply seeing that something works, or does not, for one person, means little to the next. It is much easier to use a catch-all and call DHT blockers bad for facial hair. Because if they work as intended for an individual, they are.
Known DHT Blockers
Sam at Beardology.org has compiled a list of known DHT blockers4). These comprise of products containing high quantities of lauric, oleic and linoleic acid which are three fatty acids which have been proven through scientific studies to inhibit the production of DHT.
Some also contain other components that allow them to inhibit DHT production in a different way. For example, Coconut oil inhibits DHT topically because of it’s lauric acid content, but it also inhibits DHT when ingested because of it’s beta sitosterol content.
Keep in mind that this is not a complete list so just because something does not appear on here does not necessarily mean it does not inhibit DHT.
DHT INHIBITORS:
- Aloe Vera – Linoleic Acid: 35%
- Amla Oil – Linoleic Acid: 51%, Oleic Acid: 26.4%
- Argan Oil – Oleic Acid: 42-48%, Linoleic Acid: 30-38%
- Apricot Kernel Oil – Oleic Acid: 64.2%, Linoleic Acid: 28.3%
- Avocado Oil – Oleic Acid: 67%, Linoleic Acid: 9.8% (Ingested: Beta Sitosterol)
- Black Cumin Seed Oil– Linoleic Acid: 55.6%
- Burdock Seed Oil – Linoleic Acid: 69%, Oleic: 20%
- Cocoa Butter – Oleic Acid: 29%
- Coconut Oil – Lauric Acid: ~50%, Oleic: 5-10%(unrefined) 4.39%(refined), Linoleic: 0.95%(refined) 1-2.5%(unrefined) (Ingested: Beta Sitosterol)
- Copper Peptides – The only info is that it’s actually the copper content that inhibits DHT.
- Corn Oil – Linoleic Acid: 59%
- Cottonseed Oil – Linoleic Acid: 54%
- Emu Oil – Oleic Acid: 47.4%, Linoleic Acid: 15.2%
- Evening Primrose Oil – Linoleic Acid: 72.6%
- Grapeseed Oil – Linoleic Acid: 70.6%
- Green Tea – epicatechin-3-gallate and epigallo-catechin-3-gallate
- Hazelnut Oil – Oleic Acid: 79.2%, Linoleic Acid: 12%
- Hemp Seed Oil– Linoleic Acid: 56.48%
- Kukui Nut Oil – Oleic Acid: 25.4%, Linoleic Acid: 39.8%
- Lavender Oil
- Linseed Oil (Flax Seed Oil) – Oleic Acid: 22.6%, Linoleic Acid: 17%
- Macadamia Oil – Oleic Acid: 53.8%, Linoleic Acid: 1.8%
- Mango Butter – Oleic Acid: 45%, Linoleic Acid: 3-4%
- Oat – Oleic Acid: 28-40%, Linoleic Acid: 36-46%
- Olive Oil – Oleic Acid: 55-83%, Linoleic Acid: 7.5-20% (Ingested: Beta Sitosterol)
- Palm Fruit Oil – Oleic Acid: 41%, Linoleic Acid: 9.5%
- Pine
- Poppyseed Oil – Linoleic Acid: 70%
- Pumpkin Seed Oil – Linoleic Acid: 57.2%
- Pygeum Bark
- Rosehip Seed Oil – Linoleic Acid: 44.1%
- Rosemary Oil – 12-methoxycarnosic acid (see study below)
- Safflower Oil– Linoleic Acid: 68-85%
- Sandalwood Seed Oil – Oleic Acid: 50-53%, Linoleic Acid: 1.7-2.0%
- Saw Palmetto – Lauric Acid: 26.3%, Oleic Acid: 34.6%, Linoleic Acid: 6%
- Sesame Oil – Linoleic Acid: 45.69%
- Shea Butter – Oleic Acid: 37-62%, Linoleic Acid: 6.6-10.8%
- Soybean Oil – Linoleic Acid: 52.97%
- Soy Foods – (Ingested) Contains Isoflavones (Equol) which mimic estrogen and inhibit DHT.
- Stinging Nettle Root
- Sweet Almond Oil – Oleic Acid: 66.6%, Linoleic Acid: 6-8%
- Tamanu Oil – Oleic Acid: 41.4%, Linoleic Acid: 29.7%
- Tea Tree Oil
- Tretinoin – Retinoic Acid
- Walnut Oil – Linoleic Acid: 51%
- Wheat Germ Oil – Linoleic Acid: 58.4%
- Zinc – Only in HIGH doses.
1)
Relationship between plasma testosterone and dihydrotestosterone concentrations and male facial hair growth|https://www.ncbi.nlm.nih.gov/pubmed/7126460
2)
Androgen action in cultured dermal papilla cells from human hair follicles|https://www.ncbi.nlm.nih.gov/pubmed/8003318
3)
5 alpha-reductase activity in cultured human dermal papilla cells from beard compared with reticular dermal fibroblasts|https://www.ncbi.nlm.nih.gov/pubmed/2295831