does melanotan – What It Is and Its Relation to Skin Cancer Melanotan II - Wikipedia

[10] Gastrointestinal disturbances-including nausea, loose stools, and a transient fishy body-odor attributable to trimethylamine production from excessive carnitine and choline metabolism-occur in a minority of recipients and are usually self-limiting within 24 to 48 hours after injection

Its highly unlikely

Current evidence indicates that l-carnitine may lower blood pressure, improve insulin response, and reduce insulin resistance

It has been shown that mitochondria-free axon terminals of hippocampal or cortical neurons accumulate more Ca 2+ in response to repetitive stimulation, which promotes increasingly more SV release [55, 56]

People who adhere to a vegan lifestyle or those with specific genetic issues may not produce or obtain enough L-carnitine