how long after vitamin b12 injections take to work Quickly Does a Shot Work? Benefits & What Expect What You Need to Know

Anyone taking methyl-donor-sensitive medications (some psychiatric drugs, methotrexate, methylated B-vitamin protocols at high doses): NNMT shares the methyl donor SAM, so theoretical interactions exist

They include: Pain, redness, or swelling at the injection site Mild diarrhea or nausea Itching or skin irritation near the injection area A sensation of swelling throughout the body Headache or dizziness These effects typically resolve within 24 to 48 hours and do not require medical intervention

Drugs can reduce appetite and alter metabolism, leading to nutrient deficiencies

Factors such as age, changes in the gut, autoimmune conditions, or lifestyle choices like a vegetarian diet may contribute to this