I know this is supposed to be one of the highest quality magnesium supplements, but it makes me feel really weird. I cannot tolerate this product at all. I took a tiny fraction of the recommended dose and started feeling weird. I tried this product on 2 separate occasions, with the same results. It makes me wonder if this is too absorbable. Is it possible that this product can cross the blood-brain barrier? Because I had mild hallucinations after taking it. I know some people swear by this product, so maybe the issues are just specific to me. I really don't know. I take a different, blended magnesium supplement that I really like.