My hair is thinning in my twenties. What actually works to stop it?

If your hair is thinning in your 20s, the treatments with the best evidence are minoxidil and, for many men, finasteride.[1][2][10][17] The most effective approach is usually to first confirm the cause of thinning, because treatment works best when the hair loss is pattern hair loss rather than shedding from a medical trigger like iron deficiency or thyroid disease.[3][5][9]

What actually works:

• Topical minoxidil: This is the most widely recommended over-the-counter treatment and can slow hair loss and stimulate regrowth in both men and women.[1][2][10] It needs consistent long-term use; results typically take months, and stopping it usually leads to renewed loss.[2][3]
• Finasteride: For men, this prescription drug is one of the most effective options for androgenetic hair loss and is widely used to slow or stop further loss.[2][4][17] It is generally not used in women who are pregnant or may become pregnant.[12]
• Spironolactone: In women, this prescription anti-androgen may help when minoxidil alone is not enough, especially for androgenic alopecia.[2][5][11]
• Treat the underlying cause: If thinning is from iron deficiency, thyroid disease, or another medical issue, correcting that problem can improve hair over time.[3][5][9]
• Procedures with some evidence: Low-level laser therapy and platelet-rich plasma (PRP) may help some people, but they are usually considered add-ons rather than first-line treatments.[2][5][11]
• Hair transplant: This is the main option once follicles have stopped functioning and medications are no longer enough.[2]

What is less convincing:

• Biotin, “cyclical vitamins,” exosome therapy, and many supplement-based claims have much weaker evidence than minoxidil/finasteride, unless you actually have a documented deficiency.[12][16]
• Shampoos, scalp massage, and styling changes can reduce breakage or make thinning less noticeable, but they do not reverse true pattern hair loss.[1][12]

A practical next step:

• If you’re male: ask a clinician about topical minoxidil now and whether finasteride is appropriate.[2][4][17]
• If you’re female: topical minoxidil is the usual first step; if that’s not enough, ask about spironolactone and whether you need labs for iron or thyroid issues.[2][5]
• If shedding is sudden or diffuse: get checked for triggers like recent illness, stress, low iron, thyroid problems, or medication effects.[3][5][9]

If you want, I can give you a men’s vs women’s treatment plan, including what to expect in the first 3–6 months and what side effects matter.