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However, not everyone absorbs vitamin B12 efficiently

It can lead to neuropathy, megaloblastic anemia, and pernicious anemia, [2] [13] causing symptoms including fatigue, paresthesia, depression, cognitive decline, ataxia, and even irreversible nerve damage

This cysteine-homocysteinylation event perturbs the pro-insulin receptor and furin protease interaction within the Golgi apparatus, consequently inhibiting the cleavage of the pro-insulin receptor

The 50 mg lyophilized vial format is intended for extended research protocols and bulk in vitro / preclinical assay use

PMID 29543316

However, if your arm hurts more than expected, there are several ways to reduce pain and ease discomfort