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The Injections: Why Theyre Often the First Line When a significant B12 deficiency is diagnosed, especially if its due to a malabsorption issue, your GP or specialist will almost certainly recommend injections
Water enables hydrolytic degradation, and peptides in aqueous solution are much less stable than in their lyophilized form
What's the best route of administration for gut-focused use
Some people may have no symptoms at all, even with low B12 levels
Direct injectable NAD+ has more limited human RCT data but rapid systemic availability
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