The TB-500 component (thymosin -4) is a prohibited substance under WADA Section S2 (Peptide Hormones, Growth Factors, Related Substances and Mimetics), prohibited at all times
Osman AT, Sharkawi SMZ, Hassan MIA, Abo-youssef AM, Hemeida RAM (2021) Empagliflozin and neohesperidin protect against methotrexate-induced renal toxicity via suppression of oxidative stress and inflammation in male rats
Still, a few risks deserve attention: Scalp irritation
Collagen IV production sees a dramatic 25.4-fold increase when GHK-Cu is combined with hyaluronic acid
The same studies can be located independently on PubMed using the CAS number (89030-95-5 (GHK-Cu complex)
Ice cream is particularly constipating