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Especially with this source, adverse symptoms may occur due to an vitamin B12 overdose

Price et al., Cell Metabolism )

[29] [30] Other supplements taken alongside B12, particularly magnesium, vitamin C in high doses, or probiotic preparations, may affect bowel habits

Pregnant or breastfeeding patients, and anyone currently on prescription medications that interact with B12 metabolism, should also confirm safety with their healthcare provider first

Injection site irritation: Redness, swelling, or itching at the subcutaneous injection site is the most frequent issue

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