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Vitamin B12 supplements can be a vital part of your dogs recovery and overall health when diagnosed, monitored and followed up as part of their treatment plan.

If your energy is off, other factors deserve equal attention iron status, sleep quality and duration, training load and recovery, testosterone levels, thyroid function, and how your GLP-1 protocol is affecting your overall nutrient intake

Individuals who may benet from Methylcobalamin injections include those with Vitamin B12 deciency, particularly if due to poor absorption associated with age, gastrointestinal disorders, or following certain surgeries

Pan et al., 2011

I think we can safely say the overwhelming answer would be (b)