B12 Injections vs. Oral Supplements: Which Works Better? If you have a low vitamin B12 level, injections can go a long way toward improving your health and well being. But if your B12 level is normal, don't fall for claims that Staying healthy this time of year starts at the cellular level, and B12 plays a major role., Vitamin B12 supports energy production, nervous system function, red blood cell formation, and immune Can Prilosec Interfere With Vitamin B12 Injections? The People's Pharmacy