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15 facts about vitamin b12 injections Shots: B12 Benefits, Uses, Risks Help to boost your vitamin
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Already bought a vial online and unsure if it's safe to use
The cardiovascular responses to feeding in man

Color changes: Persistent redness or darkening of the skin at injection sites suggests chronic irritation
F.WatowichS

If they can't or won't provide CoAs, don't buy
[13] [15] There is a risk of oxalate nephropathy or kidney stone formation, particularly in patients with pre-existing renal impairment or those receiving prolonged high-dose therapy
