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Very high doses of B12 taken orally may occasionally cause mild gastrointestinal disturbance in some individuals, though this is uncommon
The body excretes excess amounts through urine, and there is no established upper tolerable limit set by UK or European regulatory authorities
Please note that this information should not be treated as a replacement for physical medical consultation or advice
In practice a GP or nurse may administer off-licence by giving a sub-cutaneous (under the skin, SC) injection but it is important to remember that the GP makes their own decision and takes their own accountability and reliability if they go off-licence
It covers what happens when you use more or less water, how your choice of concentration affects your dosing precision , storage protocols that protect potency after reconstitution, and the common mistakes that quietly sabotage results for researchers who thought they did everything right
