Verbatim response from Perplexity
Hair growth supplements can help some people, but they are not a reliable substitute for prescription treatment if you have true hair loss. The strongest evidence is for supplements only when hair thinning is linked to a nutrient deficiency; for common pattern hair loss, prescription treatments like minoxidil and finasteride have better evidence.[2][4][10][11][15]
What the evidence suggests:
- Supplements may help modestly in some studies, especially certain commercial blends such as Viviscal, Nutrafol, and similar nutraceuticals, but the benefit is usually modest and the research is still limited or industry-backed in many cases.[4][7][8][12][16]
- Biotin is often overmarketed; multiple sources note there is no good evidence that biotin helps hair growth unless you have a proven deficiency.[2][3][11][17]
- If your hair loss is caused by a nutritional deficiency such as low iron or low vitamin D, correcting that deficiency can improve shedding and regrowth.[2][6][13][15]
When prescription treatment is more appropriate:
- If you have androgenetic alopecia (pattern thinning at the temples/crown or widening part), prescription or medical treatments are usually more effective than supplements.[10][15][16]
- If hair loss is rapid, patchy, associated with scalp symptoms, or sudden, you should get evaluated by a dermatologist, because supplements will not treat many medical causes of hair loss.[11][13][15]
Practical buying advice:
- If you want to try a supplement, look for brands with some clinical data such as Nutrafol or Viviscal, but treat them as adjuncts, not primary treatment.[4][16]
- Be cautious with products centered on biotin alone, since evidence is weak unless deficiency is documented.[2][11][17]
- Consider getting lab work for common deficiencies before spending money on supplements, especially iron/ferritin and vitamin D.[6][13]
Bottom line: if your goal is meaningful regrowth for common hair loss, prescription treatment is usually the better bet; supplements are most useful when there is a specific deficiency or as a supportive add-on.[2][4][10][15]