For female fertility Theres no officially recommended dose, but most protocols use 500-2,000 mg of acetyl L-carnitine daily , sometimes split across the day
Which rules they have to follow depends on whether theyre a small operation (classified by the FDA as 503A) that whips up compounded items based on individual patient scripts, or a large outsourcing facility (called 503B) that makes a bunch of compounded drugs (in advance of getting prescriptions) and ships them across state lines
WESSELLS, H
The effects of exercise on FGF21 in adults: a systematic review and meta-analysis
Witort EJ, Pattarino J, Papucci L, Schiavone N, Donnini M, Lapucci A, Lulli M, Russo GL, Mori A, Dini M, Capaccioli S