Oral Supplements: Generally take longer to show noticeable results, especially if absorption is compromised
Common side effects of B12 injections These B12 effects tend to resolve on their own within a day or two: Injection site reaction, such as mild soreness, redness, or swelling Brief itching or warmth at the injection area A feeling of fullness or pressure in the muscle Mild headache or nausea shortly after the shot These reactions are typically related to the injection itself, not the vitamin
Maybe my digestive issues will get better over time
Those with digestive issues, like Crohns disease or celiac disease, that impair nutrient absorption
[DOI: 10.1371/journal.pmed.1000100] [DOI] [PMC free article] [PubMed] [Google Scholar] Lindenbaum 1994 Lindenbaum J, Rosenberg IH, Wilson PW, Stabler SP, Allen RH