Cold-water, wild-caught fatty fish such as wild Alaskan salmon, mackerel, sardines, and anchovies (often remembered by the acronym SMASH) are excellent sources of highly bioavailable EPA and DHA
It is worth noting that there are many food products fortified with Vitamin B12 , and many pharmaceutical supplements that contain the vitamin and can be taken without a prescription, but injections containing cyanocobalamin in the form of capsules are dispensed with a prescription after the doctor performs the necessary diagnostic tests
Common causes include inadequate dietary intake, particularly in those following strict vegetarian or vegan diets that exclude meat, eggs, and dairythe primary sources of B12
So if you can get some folinic or methylfolate, that will help
Improved nutrient levels: Addressing a B12 deficiency could indirectly improve overall health