It's not a dietary supplement either it's a synthetic compound that has never been approved for human consumption, so it's sold as a 'research chemical' labelled 'research use only.' That label is how sellers avoid making medical claims
doi: 10.1111/2041-210X.12668 38 KarplusI.HulataG.ZafrirS
This nuclear localization has particularly been observed in proliferating cells including a range of different cancers such as colorectal carcinoma, melanoma, uterine cervical neoplasms, breast cancer, and hepatocellular carcinoma
Chapter 14: Completing summary of findings tables and grading the certainty of the evidence
A2780 parental and A2780 cisR cells were cultured in RPMI 1640 (BE12-167F, Lonza) supplemented with 0.58 g/L of L-glutamine, 1% FBS (S 0615, Merck) and 1% antibiotic-antimycotic (AA) (P06-07300, PAN Biotech)