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Ailment

Hair Loss / Hair Growth

Treatment Biotin

Side Effects Reported

  • Fluid Retention
  • Blurred Vision Without Vitamin B12
  • Gen Enlargement
  • Possible Pros Discomfort

Severity

Moderate
Mild
Moderate
Mild

Experience Details

Ongoing experience with Biotin for hair loss / hair growth. Biotin has been one of my core long-term supplements for improving hair growth, especially when combined with Vitamin B12 and topical castor oil. Higher doses generally produced stronger hair growth and tissue fullness, but sometimes caused side effects such as fluid retention. Around 30,000 mcg seemed to offer the best balance between results and tolerability, while 20,000 mcg produced milder effects and 40,000 mcg produced stronger effects with more downsides. Biotin also seemed to improve the effectiveness of castor oil and, when paired with Vitamin B12, appeared to improve tissue fullness and eyesight. Topical biotin was much less helpful and seemed to reduce the effectiveness of castor oil. Current overall rating: 4/5 effectiveness with 90% certainty, and I would recommend it.

Daily Tracking Record

1 entry
Date Taken Recorded update Time: Biotin
Dosage: 30000 mcg

Preferred dosage over 40,000 mcg. At around 30,000 mcg Biotin produced strong hair growth with less fluid retention than the higher dose. Overall this felt like the best balance of effectiveness and tolerability, with about 5/5 effectiveness and 95% certainty.

Long-Term Outcomes

Long-term update summary:\n1. Hair growth improved when Biotin was combined with Zinc, Vitamin C, Vitamin B12, and topical Castor Oil for roughly three weeks. Hair appeared thicker.\n2. Castor Oil did not seem to work nearly as well unless Biotin was also taken internally.\n3. Around 40,000 mcg produced excellent hair growth, increased tissue fullness, reduced forearm wrinkling, and no heart problems, but also caused fluid retention and enlargement of genital tissue.\n4. Around 30,000 mcg gave the best overall balance, with strong hair growth and less fluid retention than 40,000 mcg.\n5. Around 20,000 mcg produced milder hair-growth effects and no enlargement was observed.\n6. Vitamin B12 appeared necessary for maximum tissue fullness; eyesight also improved after adding B12. Without B12, eyesight became blurry.\n7. Vitamin B1 seemed to reduce the positive effects of both Vitamin B12 and Biotin, including less tissue fullness and reduced warmth.\n8. Topical Biotin only made hair softer and seemed to reduce the effectiveness of topical Castor Oil, so I would not continue using it topically.\n9. Current opinion: Biotin remains one of my preferred supplements for hair growth, with best results when combined with Vitamin B12, topical Castor Oil, and Minoxidil. Higher doses seem stronger but may bring more side effects.

HH
Health Hacker Jul 25, 2026 · Updated Sep 20, 2026
Important Disclaimer: This information is for educational purposes only. Consult a healthcare provider before making any health decisions.

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