can b12 injection give you diarrhea What you’re seeing here is a dog being treated for with a shot. And this isn’t a random site. It’s intentional., The area just above the anus corresponds to an acupuncture point Vitamin B12 Injection For Dogs:

But you can get it from fortified plant milks, breakfast cereals, and other foods (check the labels to make sure B12 is included)

Clinical Benefits: Regulates calcium and phosphate metabolism for bone and muscle health Supports immune system modulation and reduces susceptibility to infection Associated with improved mood and reduced risk of seasonal affective symptoms May help reduce systemic inflammation Supports neuromuscular function Effective for patients with malabsorption conditions or persistent oral supplementation failure A blood test can be arranged to confirm deficiency prior to treatment, though this is not always required

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Most people get enough vitamin B-12 in their diet, but a deficiency may occur in certain health conditions (e.g., poor nutrition, stomach/intestinal problems, infection, cancer)