There are no large clinical trials of injected GHK-Cu in humans
B12 deficiency can lead to fatigue and weakness
In obese wild-type mice, chronic experimental exposure was associated with reduced body weight and body fat, increased lipolytic sensitivity, and increased beta-3-adrenergic-receptor RNA expression in adipose tissue
The regulatory picture varies by compound: FDA-approved peptides (semaglutide, tirzepatide) are available by prescription with full manufacturing oversight, adverse event reporting, and post-market surveillance
These effects are typically mild, resolve within hours to days, and don't require treatment
[57] Adipose tissue and metabolism [edit] In obesity, adipose tissue often becomes dysfunctional