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A brief head rush or lightheadedness right after injecting resolves in minutes and isn't a concern
In my own practice, especially if an older person has risk factors for vitamin B12 deficiency, I consider a vitamin B12 level of 200-400 pg/mL borderline, and I usually order a methylmalonic acid level as a follow-up
The unsexy work : sleep, food, water, one human contact a day
Research quality note: Supplier formula listings can vary by salt form, counter-ion, acetate/TFA form or documentation style
A practical example would be a course of 6 injections over 2-3 weeks , which you can expect to pay between 150 and 300 for as a package deal
US$ 29.57
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US$ 28.69
