Uncommon but notable adverse effects include: Hypokalaemia (low potassium) can occur during initial treatment of severe megaloblastic anaemia, as rapid cell production consumes potassium
A sensible experiment spreads doses across at least three orders of magnitude, something like 1, 10, and 100 nanomolar on up to 1 and 10 micromolar, precisely because the sweet spot moves with the copper-to-peptide ratio, the buffer, and how much serum sits in the media
Corvillo F, Ceccarini G, Nozal P, et al
Anyone considering peptides should understand their local legal landscape
Vitamin B12 is a nutrient that plays an essential role in multiple bodily functions, including red blood cell production and neurological function