You are right that intravenous injections are those methods in which doctors administer drugs into our body through our veins by the use of injections just like we fill ink into the pen so this is one of the most effective way of getting quick relief from your pain I agree with you and I have also written same in my post and I agree with you that there are many people who have weak immunity and immunity most of the time comes from gut so if you are gut is weak then you would be no able to absorb vitamin B12 that's why it is highly recommended to take vitamin B12 through injection.

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