b12 injections and ferritin can increase levels Ferritin B12 Vitamin D Your Hair Growth Explained Haematinics Interpretation | Iron Studies

It is important to distinguish between excessive supplementation and pathologically elevated B12 levels, which may indicate underlying haematological disorders, liver disease, or renal impairment rather than true overdose

doi:10.1016/j.phrs.2016.11.018 Aviram M, Dornfeld L, Rosenblat M, et al

Examples include Marmite and Nutritional Yeast

Food provides a buffer that can decrease direct contact between the supplement and the gastric mucosa, whilst also slowing gastric emptying

Many clinics use pre mixed or mass- produced formulations that can lose potency, contain unnecessary fillers, or fail to meet medical grade standards

This way, you can feel confident that youre getting the best treatment possible