Travis
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- Jul 14, 2016
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I beg to disagree a bit. Enoxolone is actually an indiscriminate inhibitor of 11b-HSD - i.e. it inhibits both type I and II. This leads to increase in cortisol levels due to decreased degradation, even though new synthesis is also inhibited. This is why enoxolone leads to high blood pressure in humans and it not used more often clinically. I considered it as a supplement years ago but its indiscriminate 11b-HSD activity convinced me not to do it. I have tried it myself and it does lead to excess mineralocorticoid symptoms including water retention and weight gain around the midsection.
Enoxolone - Wikipedia
"...The structure of glycyrrhetinic acid is similar to that of cortisone. Both molecules are flat and similar at position 3 and 11. This might be the basis for licorice's anti-inflammatory action.[citation needed] 3-β-D-(Monoglucuronyl)-18-β-glycyrrhetinic acid, a metabolite of glycyrrhetinic acid, inhibits the conversion of 'active' cortisol to 'inactive' cortisone in the kidneys.[6] This occurs via inhibition of the enzyme by inhibiting the enzyme 11-β-hydroxysteroid dehydrogenase.[citation needed] As a result, cortisol levels are high within the collecting duct of the kidney. Cortisol has intrinsic mineralocorticoid properties (that is, it acts like aldosterone and increases sodium reabsorption) that work on ENaC channels in the collecting duct.[citation needed]Hypertension develops due to this mechanism of sodium retention. People often have high blood pressure with a low renin and low aldosterone blood level.[citation needed] The increased amounts of cortisol binds to the unprotected, unspecific mineralocorticoid receptors and induce sodium and fluid retention, hypokalaemia, high blood pressure and inhibition of the renin-angiotensin-aldosterone system. Therefore, licorice should not be given to patients with a known history of hypertension in doses sufficient to inhibit 11-β-hydroxysteroid dehydrogenase.[7]"
What is implied is that it should be quite safe topically. The kidneys of course have the 11β-HSD₂ working in the opposite direction, so taking enoxolone—or its all natural glycone found in licorice—certain can cause extreme mineralocorticoid effects due to excessive cortisol. I am even fairly certain that this has killed people, as has other natural mineralocorticoid-active molecules like digoxin, oubain, and solanine.
But topically, I think you could expect local inhibition of cortisol synthesis. There are better drugs out there, that work in a more direct way, but this has been tested topically on rats and they all had survived and the all had increased hair growth—proving that cortisol was being inhibited and had not increased, as would occur if the skin were to contained 11β-HSD₂ and not 11β-HSD₁. Although spironolactone would be a more direct approach, topically, it is more expensive and difficult to acquire.
Saumendu, D. "Hair growth stimulating effect and phytochemical evaluation of hydro-alcoholic extract of Glycyrrhiza glabra." Global Journal of Research on Medicinal Plants & Indigenous Medicine (2014)
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