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Protein's role in hair growth is complex, with specific amino acids like cysteine being crucial for effective hair growth. Users discussed using l-cysteine supplements, noting reduced hair loss and faster growth, though some experienced digestive issues.

Whey protein is unlikely to cause hair loss, and some users suggest it might be beneficial if dietary protein is insufficient. Hair loss is generally considered genetic, and there is skepticism about the dermatologist's advice to switch from whey protein to whole foods.

Whey protein may slightly increase hair loss in men with androgenetic alopecia (AGA) due to elevated IGF-1 and testosterone levels, but the effect is minimal compared to treatments like finasteride and dutasteride. Many users argue that whey protein's impact on hair loss is negligible and that maintaining a healthy lifestyle is more important.

The user started using ketoconazole shampoo and whey protein shakes and noticed increased hair shedding, seeking advice on whether these could be the cause. Another user shared their experience with hair loss after starting protein shakes and mentioned using finasteride, which eventually improved their hair condition.

A user is experiencing genetic hair loss and is using spironolactone and minoxidil without success. They are considering switching to vegan protein powder due to digestive issues and are concerned if it will worsen hair loss.