No serious long-term side effects have been reported from regular therapeutic use
This is because injections of TB4 into the hearts of mice (both injured and uninjured) basically kick-started repair processes and made the epicardium (the outermost layer of the heart) behave as it does in embryonic development
If your goal is testosterone enhancement, other approaches may be more appropriate
Peptides have become the beauty world's latest buzzword and one of the biggest skincare trends, with dermatologists and skincare gurus highlighting their anti-aging benefits across social media
Cruciferous vegetables like broccoli, Brussels sprouts, and cauliflower are excellent sources
J Clin Med 8(5):756 [DOI] [PMC free article] [PubMed] [Google Scholar] Darras VM, Van Herck SL, Heijlen M, De Groef B (2011) Thyroid hormone receptors in two model species for vertebrate embryonic development: chicken and zebrafish