Overt vitamin B6 deficiency is rare, but approximately 10 percent of Americans may have inadequate B6 status, and it often occurs with deficiencies in other B vitamins like folate and B12
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Both oral cyanocobalamin and injectable hydroxocobalamin list diarrhoea as a rare adverse reaction in UK product information
Oral B12 supplements have to pass through the gut, and absorption can be limited especially if you have digestive issues, take certain medications like metformin or antacids, or simply have low stomach acid
Detailed Instructions If youre still unsure how or where to give B12 injections, visit our full instructions
If youre correcting a deficiency, you might start with weekly injections and shift to monthly maintenance