storing b12 injections Cyanocobalamin Injection: Energy & Nerve Health Boost — Mountainside Medical Vitamin B12 Injections - Cascadia

[10] [12] High-dose ascorbic acid may diminish the therapeutic effects of certain chemotherapeutic agents, such as bortezomib, due to its antioxidant properties

You might be a good candidate if you have confirmed low B12 levels (from lab work), follow a strict vegan/vegetarian diet, have digestive issues reducing B12 absorption (e.g., after gastric surgery, or with conditions like Crohns), or experience chronic fatigue and other symptoms linked to B12 deficiency

Summary: Excessive vitamin B12 intake rarely causes toxicity, but very high levels from supplements or injections may be associated with skin reactions such as acne-like eruptions, though serious adverse effects remain exceptionally uncommon

Yes, but the answer depends on which peptides you are asking about and what you define as working