Some individuals report feeling more alert or experiencing difficulty sleeping after taking B12 supplements, particularly high-dose formulations or injections
This small, membrane-permeable molecule with chemical formula C10H11N2+ works by improving glucose clearance from the blood and enabling cells to more rapidly use available energy
These can include pain at the injection site, mild diarrhea, or an allergic reaction
The foods highest in vitamin B12 are: Organ meats, such as beef and chicken liver Wild-caught fish, including salmon, herring, mackerel, tuna, trout and sardines (also great sources of other vital nutrients, like omega-3 fatty acids) Organic dairy products, including probiotic-rich yogurt or raw milk Pasture-raised poultry, including turkey or chicken Grass-fed beef and lamb When its not possible to get enough vitamin B12 from your diet, perhaps due to genetic conditions or taking necessary medications, someone might choose to boost intake of vitamin B12 in several ways other than receiving injections
