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Nicotinic acid can cause flushing, itching, and gastrointestinal disturbances at relatively low doses, while nicotinamide has a higher guidance level

How does L-Carnitine Support Fat Metabolism

Raun et al., Ipamorelin, the first selective growth hormone secretagogue, Endocrinology, November 1998

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Other relevant interactions: Colchicine (used for gout) may affect B12 absorption with long-term use Chloramphenicol (rarely used antibiotic) may blunt the haematological response to B12 treatment Monitoring considerations: Patients taking loop or thiazide diuretics require careful monitoring when initiating B12 therapy in severe deficiency, due to the risk of hypokalaemia during rapid cell production