I tried it a few times and it had zero effect on my tennis elbow
Stanaway JD, Reiner RC, Blacker BF, Goldberg EM, Khalil IA, Troeger CE, Andrews JR, Bhutta ZA, Crump JA, Im J, Marks F (2019) The global burden of typhoid and paratyphoid fevers: a systematic analysis for the Global Burden of Disease Study 2017
Injectable forms have a defensible role under medical supervision for specific indications
Glutathione + Hydrolyzed Collagen: Powerful glutathione + skin-firming collagen help fade dark spots, improve elasticity & promote a youthful, radiant complexion with consistent use
Another, sold as Horse Peak Gelatin, added maltodextrin a cheap filler that contributed nothing to male health