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I typically don't recommend this kind of B12

Glutathione levels in the body can be depleted by several factors, including poor nutrition, environmental toxins, and stress

If you have had weight-reduction surgery or have pernicious anemia, celiac disease, or Crohn's disease, B12 injections may be recommended

Yes, peptides can generally be used with retinol in skincare routines

Initial blood work is recommended to confirm whether a patient is genuinely deficient in B12 and needs supplementation, or whether another underlying issue may be affecting energy, weight, or metabolic function

It is not medical advice, not a recommendation for human administration, and not a substitute for ethics-approved protocol review at your institution