In addition, poor mood and concentration, irritability, depressive symptoms, inability to sleep normally, nausea, vomiting, diarrhea, and even numbness and tingling in your hands and feet can be signs of a Vitamin B12 deficiency
The first lever is the dose, not a supplement: active fatigue, nausea, or a high resting heart rate is the signal to hold the current step rather than climb into it
B-12 is generally safe as a supplement, but injections guarantee the right levels ofabsorption
It has also been investigated for its effects on cortisol levels, GH release, and immune system balance, providing insight into how sleep and stress are interconnected at the molecular level