A plant extract with weak evidence for hair loss. In the one comparison study it did much less than finasteride, and it has its own side effects.
Cosmetic ingredient blend marketed for thinning hair; the evidence is supplier studies and small multi-ingredient product trials.
Plant oil used in scalp products; hair-growth evidence is from one mouse study. It can cause skin allergy, and case reports link lavender products to breast growth in children.
A prescription estrogen hormone that is not approved for hair loss. Evidence that it regrows hair is weak, and it carries serious whole-body risks, including a US boxed warning.
Provitamin B5 used in hair and skin products as a moisturiser; evidence for hair growth is limited to lab studies and small uncontrolled reports.