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Picking the wrong one doesn't just cause a denial
For cats, obtaining B12 adequately from their diet is generally not a problem
For broader context on peptide categories, see our types of peptides
A deficiency in B12 can lead to a significant decrease in energy and exercise tolerance, along with fatigue
Beuckmann CT, Fujimori K, Urade Y, Hayaishi O
What has been reported in the available human pilot research is that no significant adverse effects were observed - which is a meaningful data point for safety consideration, even if it does not establish efficacy by clinical standards
