Vitamin B12 is crucial for several physiological processes, including: Red blood cell formation deficiency leads to megaloblastic anaemia, characterised by large, immature red blood cells Neurological function B12 is required for myelin synthesis and nerve health DNA synthesis essential for cell division and growth Without adequate B12, patients may develop symptoms such as fatigue, pallor, shortness of breath, glossitis (sore tongue), paraesthesia (pins and needles), and in severe cases, neurological complications including peripheral neuropathy, ataxia, and cognitive impairment

Slower titration is worth considering if: Nausea persists beyond 2 weeks at your current dose You experience significant GI symptoms that interfere with daily function Your body aches or muscle pain are severe You are losing weight faster than 1 to 2 percent of body weight per week (too-rapid weight loss increases muscle loss risk) Some researchers use a 6 or 8-week interval between dose increases instead of the standard 4 weeks
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Different types of serotonin receptors are found throughout the brain and intestinal tract, causing diverse effects of serotonin.[ref] One big link between migraines and serotonin is that triptans , the most commonly used migraine prescription medication, work by amplifying the serotonin signal