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doi: 10.1016/j.ntt.2011.07.006 255
This is the more sensitive marker for early deficiency
These studies reported subjective pain improvements and mobility increases, though they lacked appropriate placebo controls and blinding
Rankings are based on five criteria a reader can independently verify: whether the supplier publishes per-batch Certificates of Analysis, whether those certificates can be viewed before purchase, which analytical methods the testing uses, pricing per 10mg vial, and domestic shipping and packaging practice
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