A B12 deficiency is more than just feeling tired
Certain medications such as Metformin, H2-receptor antagonists including Zantac (Ranitidine), Tagamet(Cimetedine), Famotidine, Pepcid AC (Oral Pepcid), Axid AR (Nizatidine), Proton pump inhibitors (PPIs)including Prilosec (Omeprazole), Nexium (Esomeprazole), Prevacid (Lanzoprazole) and Antacids e.g:Gaviscon can also affect your ability to absorb vitamin B12
Some patients report temporary fatigue, headache, or mild GI discomfort in the first 24 to 48 hours following an injection, particularly with their first dose
B12 is one of the safest things you can put in your body
Deficiency of Vitamin B12 can affect the fertility of both and affect the reproductive systems of either in a similar manner