View full bio Written by Melissa Chester, BHSA
Aside from fatigue, there are a few other early signs of deficiency you can watch out for: Numbness or tingling in your hands, feet, or legs Always cold or unable to warm up, especially your hands or feet Weakness Ulcers on your gums or tongue Digestive issues such as lack of appetite, unexplained rapid weight loss, or constipation Can You Take B12 While Pregnant
Here is the plain version: what it is, where the hype outruns the proof, how to cycle it, the hard safety lines, and what the messy 2026 rules mean
Lost 6 lbs during month one
Products marketed as for research only are a red flag for personal medical use unless they are part of a legitimate research study through a legitimate research institute