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Was I using the wrong stuff for low B12

Whilst the quantities are minuscule and generally harmless, individuals with impaired kidney function may theoretically have reduced capacity to eliminate this cyanide with very high doses over extended periods, though this remains largely theoretical at normal supplemental doses

Vitamin B12 injections are the most common way to treat or prevent the B12 deficiency

Within 48 hours after injection of 100 or 1,000 mcg of Vitamin B12, 50 to 98% of the injected dose may appear in the urine

PMID 18709899

This leads to more efficient fat oxidation and a visible reduction in body fat when paired with proper diet and training