Symptoms of Vitamin B-12 Deficiency Fatigue and Weakness Low Moods Low Concentration Level Loss of Appetite Constipation Poor Memory Foods Rich in Vitamin B-12 Beef and chicken liver Wild-caught fish such as salmon, trout, and tuna Grass-fed beef and lamb Pasture-raised poultry Organic dairy products like milk and yogurt Who Is Most Likely to Have a Vitamin B-12 Deficiency
Endocrine (2017) 58(2):3869
Should I stop my regular medications before glutathione therapy
K.RoszkowskaM.MagnowskaM.BaczynskaE.DasN.et al (2018)
In addition, B12 deficiency-associated fatigue is often accompanied by other symptoms such as numbness and tingling, cognitive impairment (memory and concentration problems), mood swings (depression), skin changes (pale skin), shortness of breath, or fast heart rate
They are simply starting points for further research