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I always thought that injections were safer and better.
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Not really. It is still useful for some people. The biggest reason to do it is because it is very quick when levels are very low. Kind of like when you have an infection and they give your an antibiotic injection to get the ball rolling but then you just take the pills for the rest of the time.
You know when you eat the fact is you are taking in toxins all the time. But your body is built to deal with them in various ways. Some of those ways work throught the digestion system. Some throught the liver and the kidneys.
Sometimes older people need more b-12 because of atrophic gastritis. Vitamin b-12 is attached to proteins and when you have that there is not enough hydrochloric acid to cleave the b-12 from the proteins. The used to give injections for that. But is you take an oral b-12 supplement there is no protein....so no problem!