If the peptide is a peptide hormone or cytokine standard measured in activity units, ensure you know the mass-to-unit conversion from the datasheet to make the correct final concentration in terms of units/mL
It is not for resale, diagnostic, or therapeutic applications
Common indications include: Pernicious anaemia an autoimmune condition where the stomach cannot produce intrinsic factor, a protein necessary for B12 absorption [8] [9] Malabsorption disorders including Crohn's disease, coeliac disease, or following gastric surgery Strict vegan or vegetarian diets with confirmed deficiency though high-dose oral B12 may be sufficient if no malabsorption exists Certain medications such as metformin or proton pump inhibitors that may interfere with B12 absorption [9] [10] Neurological symptoms including peripheral neuropathy, memory problems, or balance difficulties related to deficiency Diagnosis should be confirmed through blood tests measuring serum B12 levels, full blood count, folate, and often anti-intrinsic factor antibodies

Lukes Family Medicine Residency Program in Bethlehem, PA, provide a good overview of B12 deficiency recovery and the expected time it usually takes: Table 4 lists the usual times until improvement for abnormalities associated with vitamin B12 deficiency
Peptides are organic molecules that are produced endogenously in all organisms
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