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Other Digestive enzyme supplements: If your dogs B12 deficiency is due to a digestive issue like EPI (see above section, What can cause B12 deficiency in dogs?), then adding a digestive enzyme supplement can help them break down food better and may improve the absorption of B12 and other nutrients

M. Jzwiak, M. Bauer, W. Kamysz, and P. Kleczkowska, Multifunctionality and Possible Medical Application of the BPC 157 PeptideLiterature and Patent Review, MDPI AG, Jan. 2025. doi: 10.3390/ph18020185

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Eggs: A simple and versatile source of B12

Still unsure about how to give yourself a B12 injection at home

But until then, the evidence ceiling is 12 weeks in humans and 90 days in rodents