Some treatments in development hold particular promise for women. Angela Christiano, a hair geneticist and Columbia University professor of dermatology, is hoping to begin clinical trials in a year or two on a procedure in which she dissects hair-follicle stem cells, grows them in the lab until she has several million, then injects them into the scalp, where, a very small study done with a human skin model has shown, they induce new hairs.
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In February, though, Ms. Telford, 46, flew from her home in London, Ontario, to Sarasota, Fla., for a new $1,400 hourlong treatment known as platelet rich plasma (P.R.P.), which is said to stimulate dormant hair follicles. The procedure involves drawing blood, spinning it in a centrifuge to extract the plasma, adding various nutrients (like more protein), then injecting the resulting mixture in one-inch intervals in a grid on the top of the scalp, which has been numbed with a local anesthetic.
The other main hair-loss treatment that was recommended by all four dermatologists I interviewed is finasteride, often called by its brand name Propecia. This FDA-approved medication is only available with a prescription, but these days, it’s found as a generic and ordered online after a virtual consultation, through start-ups like Hims, Keeps, and Lemonaid.