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I also get pain at the old site when I do physical work or exercise

Product label: CYANOKIT (hydroxocobalamin) injection, powder, lyophilized, for solution [Meridian Medical Technologies, Inc.] Last revised: April 2011 [DailyMed] Known hypersensitivity to hydroxocobalamin or vitamin B12 must be taken into benefit-risk consideration before administration of Cyanokit, since hypersensitive reactions may occur in patients receiving hydroxocobalamin

One small study showed that taking 200mg daily showed some improvements in semen parameters

The Metabolic Leak That Might Be Sabotaging Your Body A tiny molecule targeting a hidden metabolic leak shows shocking effects on strength, fat loss, and metabolic health