Here is what the evidence says, clearly and without exaggeration
13 / 13 Talk to your doctor about B12 supplements, both during pregnancy and breastfeeding
The nasal administration route enables efficient drug delivery by avoiding degradation in gastric juices and improving systemic absorption
subcutaneous or intramuscular, meaning its used for shots given under the skin or into a muscle for treatment, prevention, or diagnosis, but does not include the drugs cost or intravenous injections
The most common types of cancers that cause B12 deficiency are mentioned below: Gastrointestinal Cancers The prevalence of gastrointestinal (GI) tract cancers, such as cancer of the small intestine, pancreas, or colon, is often higher in individuals with Vitamin B12 deficiency