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Rarely reported symptoms associated with excessive B12 intake may include: Skin reactions : Acne-like eruptions or rosacea-type dermatitis have been occasionally reported, particularly with high-dose intramuscular injections Gastrointestinal disturbance : Mild nausea, diarrhoea, or abdominal discomfort, though these are uncommon Headache : Infrequent reports of headaches following parenteral B12 administration Hypersensitivity reactions : In very rare cases, allergic reactions to injectable B12 preparations have been documented It is crucial to note that there is no established link between standard B12 supplementation and serious adverse effects
Its thin membrane helps optimize absorption
Research Evidence: advantage goes to NAD+
Endocrinology 136(8):35853596 Drucker DJ (2006) The biology of incretin hormones
The REDEFINE 2 trial examined the combination in adults with type 2 diabetes, where weight loss is typically harder to achieve due to insulin resistance and medication effects
Machado 2008
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