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TL;DR: ProHealth Longevity BPC-157 Ultra Probiotic is a synbiotic supplement combining 500mcg BPC-157 Arginine Salt with MicrobiomeX prebiotic, Clostridium butyricum probiotic, and ButyroGen tributyrin postbiotic - priced at $99.95 for 30 servings
Now, the difficulty with low B12 levels are that yes, they are more likely to be associated with intestinal problems, but we don't always get overt diarrhea or vomiting with those diseases
Bergknut N, Rutges JP, Kranenburg HJ, Smolders LA, Hagman R, Smidt HJ, Lagerstedt AS, Penning LC, Voorhout G, Hazewinkel HA, Grinwis GC, Creemers LB, Meij BP, Dhert WJ: The dog as an animal model for intervertebral disc degeneration