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For older adults who are already deficient, taking one milligram of vitamin B12 daily for a month has been shown to reverse the deficiency and appears to be safe and without side effects

It is also used as an antidote to cyanide poisoning

In terms of cost, phentermine is reasonably priced (even though it is not the safest medication out there)

Mrin P, Kvist H, Lindstedt G, Sjstrm L, Bjrntorp P

Deficiency is particularly common in elderly people, because the ability to absorb vitamin B12 can decrease with age ( Other people at risk of deficiency include those who have had intestinal surgery, including weight loss surgery

The sad and frustrating thing is that despite diagnosis and treatment, I still struggle with PA