Temporary pain or redness at the injection site is also reported in some people
I have not experienced any nausea, or any negative side effects as described
B12 is typically absorbed through the stomach, so if you havestomach issues or have taken many common medications you may not be able to absorb it as effectively
Required evidence may include clinical studies, extensive post-marketing use data, expert advice, and the views of relevant health professionals and public associations
Retrieved 9 November 2019
According to the NIH Office of Dietary Supplements, functional B12 deficiency is most commonly seen in patients with one or more of the following: Age over 50 stomach acid production declines with age, and stomach acid is required to free B12 from food PPI or H2 blocker use reflux medications suppress the acid needed for B12 absorption Metformin use, which interferes with B12 absorption directly Vegan or vegetarian diets B12 is found almost exclusively in animal products Gut conditions including celiac, IBS, SIBO, and Crohns MTHFR mutations that affect how B12 is metabolized once absorbed Heavy alcohol use The symptoms of low B12 are easy to dismiss: fatigue, brain fog, low mood, tingling in the hands or feet, weakness, and shortness of breath on mild exertion
