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Description
Riboflavin itself is nontoxic

Retest b12 in 12 months

Science 347 , 13741377 (2015)

Nutritional deficiencies in vitamin C, K, or iron also impair blood vessel integrity and healing speed
DOI: 10.3390/nu13010111

O (Outcome): Primary outcome: changes in serum Vitamin B12 levels, clinical improvement of Vitamin B12 deficiency symptoms
