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    Created in 2008, Phoenix Rising is the largest and oldest forum dedicated to furthering the understanding of, and finding treatments for, complex chronic illnesses such as chronic fatigue syndrome (ME/CFS), fibromyalgia, long COVID, postural orthostatic tachycardia syndrome (POTS), mast cell activation syndrome (MCAS), and allied diseases.

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  1. linusbert

    Vitamin D levels not rising after high dose, why?

    i had 6 month ago a real deficiency, vitamin D was 4ng/ml. calcium blood levels started to go low, magnesium and vitamin c were not tolerated anymore. now i took over the last 4-5 month roughly 600.000 ie in weekly dosages of 35000 iu. and it is now at ~10ng/ml . and they even measured 1 day...