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There is no data available to determine whether there is cross-allergy with Chinese herbs that have been used as blue/green dye, such as Ban Lan Gen (Radix isatidis), Da Qing Ye (Folium isatidis) and Qing Dai (Indigo naturalis)
Most patients see improvements within days with injections and within weeks with oral forms
When endogenous synthesis is insufficient or rapidly depleted, supplementation through injectable formulations becomes clinically relevant
PMID 2137911 Subcutaneous injection-site pharmacokinetics FDA review
Immediate Impact : B12 shot provide an immediate boost in B12 levels, which can quickly alleviate symptoms of deficiency such as fatigue, cognitive decline, and mood disturbances
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