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High-dose therapy may also cause a brief increase in blood pressure, though this usually returns to baseline within a few hours

As the NHS explains, you should see a GP if you're experiencing symptoms of vitamin B12 because these conditions can often be diagnosed based on your symptoms and the results of a blood test

Unfortunately, such vitamin B12 injection dosage and frequency advice is common

Some pharmacokinetic studies suggest that only around 1.52.5 g of B12 is absorbed from food per meal, while approximately 5% of a 25 g dose and only 1% of a 1,000 g oral dose is effectively absorbed (Devi et al., 2020

The Red Flags That Scream Injections Only If youve got intrinsic factor antibodies, a history of stomach surgery, or youre on proton pump inhibitors long-term, oral B12 is probably going to fail regardless of how much you take