is l carnitine harmful L-CARNITINE increases muscle mass, reduces fat mass L-Carnitine Supplements: Benefits, Dosage and

This is generally not concerning unless levels are extraordinarily high or there are other clinical concerns

This is a primary reason why some supplements are more expensive than others

Acetaminophen-induced liver injury in obesity and nonalcoholic fatty liver disease

Cappiello F, Liu H, Editorial

Potential side effects may include: Water retention Joint pain Numbness or tingling Insulin resistance Headaches Hormonal imbalances Injection site reactions More serious concerns include: Long-term cancer risk (due to IGF-1 stimulation) Endocrine disruption Unknown contamination in unregulated products Additionally, many peptides are banned by sports organizations, such as the World Anti-Doping Agency