They are legal under specific regulatory frameworks that allow compounding pharmacies to produce medications when there is a documented shortage or when customization is medically necessary
NOW Foods L-Carnitine 1,000 mg : Best GMP Certified Best GMP Certified 1,000 mg purest form L-carnitine in 100 tablets from the most quality-certified supplement manufacturer 8.8/10 A clean, single-ingredient L-carnitine at 1,000 mg per tablet from the most quality-certified brand in the supplement industry
Maiti A, Kantarjian HM, Popat V, Borthakur G, Garcia-Manero G, Konopleva MY, MD, DiNardo CD, Verstovsek S, Andreeff M , Kadia TM, Afujo HO, Goswamy GV, Blanco C, Velasquez M, Daver NG, Pemmaraju N, Pierce S, Wierda W, Kornblau S, Ravandi F, Cortes JE
however, they have adverse effects and low adherence to long-term medication (11)
BioMed Res Int (2017) 2017:16