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Low-BMI, sub-160 lb, older, or side-effect-sensitive non-micro users often start at 0.3 mg, with the band still building to at least 1 mg before response is judged
The most commonly reported effects are mild and transient: slight headache or nasal irritation with intranasal use, and minor injection site sensitivity with the subcutaneous route
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What Are Vitamin B12 Side Effects
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