How It Works
Finasteride selectively blocks type II 5α-reductase, the enzyme that converts testosterone into DHT. By lowering scalp and serum DHT levels by up to 70%, it protects hair follicles from miniaturization. This action helps maintain existing hair and can regrow recently lost hair in some individuals. Lowering DHT also reduces prostate size in men with BPH. However, reducing DHT can impact sexual function, mood, and hormonal balance in a subset of users.
How to Use It
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Dosage:
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Hair loss: Oral 1 mg/day or topical 0.25–0.5 mg/day (formulated for scalp absorption).
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BPH: Oral 5 mg/day.
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Frequency: Once daily at the same time each day for stable serum levels.
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Cycle Length: Continuous use — stopping will cause DHT levels to return to baseline within ~2 weeks, potentially restarting hair loss.
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Stacking: Often combined with Minoxidil for enhanced regrowth, Ketoconazole shampoo for scalp DHT control, or RU58841 for targeted DHT blocking at the follicle.
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Post-Cycle Therapy (PCT): Not required, as it is not a suppressive anabolic compound.
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Precautions:
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Oral form has higher risk of systemic side effects compared to topical.
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Some users experience “post-finasteride syndrome” (persistent side effects after stopping), though this is debated in the medical community.
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Avoid in women who are pregnant or may become pregnant — risk of birth defects in male fetuses.
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Positive and Negative Side Effects
Positive Side Effects
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Significant slowing or halting of androgenic hair loss
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Possible regrowth in thinning areas
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Reduces prostate enlargement symptoms in BPH
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Once-daily dosing convenience
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Can be effective in both oral and topical forms
Negative Side Effects
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Possible sexual side effects (reduced libido, erectile dysfunction, decreased ejaculate volume)
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Mood changes or brain fog in some users
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Rare cases of persistent side effects after discontinuation (“post-finasteride syndrome”)
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Mild reduction in muscle fullness due to lowered DHT
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Does not reverse hair loss if follicles are completely inactive
Product Disclaimer
We always suggest to do your own research before making a decision on which formulas are best for you. Listening to others may put you in danger, and we always recommend for newcomers to make themselves informed of all the benefits, and side effects.