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Other than patients who have had their stomachs bypassed, there is also an autoimmune condition known as pernicious anemia that leads to a deficiency of intrinsic factor, lack of ability to absorb vitamin B12 and therefore poor availability of cobalamin (vitamin B12)
About 1 in 10 people aged 55 years and over are affected by PN, and the most common cause is diabetes
Vitamin B12 deficiency has a wide range of consequences along with fertility and sexual problems such as weakness, tiredness, constipation and many more which can lead to the damage of the nervous system
I certainly havent tried them all, but these are the ones that Ive come across
Injections provide a direct method of supplying your body with the Vitamin B12