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Supplements for Oral Use
- Astaxanthin
 
Astaxanthin is a 5-alpha-reductase inhibitor; blocks dihydrotestosterone production. Take 6-12 mg of astaxanthin daily, in divided doses, for many months.
- Beta-sitosterol
 
Beta-sitosterol is a 5-alpha-reductase inhibitor; blocks dihydrotestosterone production. Take 75-150 mg of beta-sitosterol daily, in divided doses, for many months.
- Black cohosh
 
Black cohosh is a 5-alpha-reductase inhibitor; blocks dihydrotestosterone production. Take 80-120 mg of standardized black cohosh extract daily, containing 2.5% of triterpene glycosides, in divided doses, for many months.
- Pumpkin seed extract
 
Pumpkin seed extract is a 5-alpha-reductase inhibitor; blocks dihydrotestosterone production. Take 250-500 mg of pumpkin seed extract daily, in divided doses, for many months.
- Saw palmetto
 
Saw palmetto is a 5-alpha-reductase inhibitor; blocks dihydrotestosterone production. Take 320 mg of standardized saw palmetto extract daily, containing 85-95% of fatty acids and sterols, in divided doses, for many months.
- White willow bark
 
White willow bark is a 5-alpha-reductase inhibitor; blocks dihydrotestosterone production. Take white willow bark extract daily, containing 120-240 mg of salicin, in divided doses, for many months.
- Pumpkin seed

Pumpkin seed is a 5-alpha-reductase inhibitor; blocks dihydrotestosterone production. Take 10-20 g of pumpkin seed daily, in divided doses, for many months.
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