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According to NHS guidelines: Below 200 ng/L (148 pmol/L) Generally indicates deficiency Below 100 ng/L (75 pmol/L) Usually shows clinical or metabolic evidence of deficiency Most healthy people have levels around 500 ng/L However, its worth noting that some people experience symptoms even with B12 levels in the normal range, particularly older adults
Both are complementary: empirical studies document superior hair density with combination than with each alone
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Storage Guidelines: Prior to reconstitution, the lyophilized powder is highly stable and should be stored away from light at -20C
Price Range: Research-grade vials typically run $60-$120 per 10mg vial from online suppliers (research-use-only, not for human consumption)
