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These can be signs of an early B12 deficiency or other nutritional deficiencies like folate, vitamin B2 (riboflavin), and vitamin B3 (niacin) deficiency
This product page lists the current purity specifications and routes to the lab reports hub and COA reading guide
Originally, the Schilling test was used for this purpose, but it is no longer used in view of the safety factors related to the use of radioactive B12 ( 57 Cocyanocobalamin) (Sobczynska-Malefora et al., 2021)
Most side effects are mild and transient
No - see contraindications below
Detachable-needle setups may use a Luer-lock or Luer-slip syringe
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