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However, SPECT has not been completely replaced by PET because of the benefit of lower cost, greater accessibility, and the longer stability of tracers
The magic is in their synergy
Despite this promise, several critical limitations remain: No large-scale, randomized controlled human trials to confirm efficacy, safety, or long-term impact Toxicology and pharmacokinetic data are lacking, especially for chronic use or high-dose regimens Only one stereoisomer (all-L form) has been tested
Vitamin B12 is water soluble and can be administered by intramuscular or deep subcutaneous injections, so regardless of whether you inject into fat or muscle, it will absorb into your body
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