Skin, hair and topical compounds.

Almost everything here is applied rather than injected, which changes what tracking is for: the dose is rarely the variable, consistency and elapsed time are. Visible change in skin and hair runs on a three-to-six month clock, which is long enough that memory is useless and a photograph taken under the same conditions is the only honest comparison.

Common questions

How long before anything is visible?

For hair, most protocols are judged at three to six months, because that is the length of the growth cycle involved. For skin, weeks to months depending on the active. Either way it is longer than the interval at which people give up.

What makes a before/after photo comparable?

Same lighting, same distance, same angle, same time of day, no flash change. BioHack Track pairs photos to the check-in they were taken with, so the comparison is dated rather than guessed.

Are the topicals dosed like the injectables?

No, and the ranges on those pages reflect it — concentration and application frequency rather than a mass per dose. The compound page states the route explicitly.

Every figure on these pages is sourced the same way — see the editorial policy for the hierarchy, and the full library for all 208 compounds.