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Cell suspensions were passed through a 70 m and 40 m cell strainer (BD Bioscience), resuspended in 2.5 mL of 40% Percoll preparation (20 mL Percoll [GE Healthcare], 2.2 mL 10PBS, 27.8 mL HBSS without Ca 2+ and Mg 2+ [Sigma-Aldrich]) and layered onto 1.5 mL 60% Percoll (30 mL Percoll, 3.3 mL 10PBS, 16.7 mL HBSS)

Khawaja AA, Chong DLW, Sahota J, Mikolasch TA, Pericleous C, Ripoll VM, et al

They are intended to decrease skin wrinkles, as well as thicken hair, says Retelny

That does not make the less-proven ones worthless, but it does mean you should approach them with clear eyes, work with a physician who understands the literature, and prioritize the interventions with the strongest evidence first