Hydroxocobalamin, the form most commonly used in the UK, may cause: Injection site reactions (pain, redness, or swelling) Temporary reddish discolouration of urine Rarely, hypersensitivity reactions Very rarely, hypokalaemia in severely deficient patients when treatment is initiated (potassium levels should be monitored in severe deficiency) B12 injections are considered very safe, with no upper tolerable limit established, as excess B12 is excreted in urine
HDL cholesterol modestly increased across the dose range, while LDL cholesterol showed minimal change a pattern consistent with weight-mediated lipid improvements rather than direct drug effects on LDL pathways
This suggests copper peptides can help hair grow in real patients, but the trial was small and done at a single clinic, so larger studies are still needed to be sure
Does iron always need addressing before starting B12 injections