I have been taking magnesium citrate for about 4 years and have purchased from Now Foods via Amazon. I have recently obtained a new supply from Wellness Store also via Amazon. Both claim to be 100% pure magnesium citrate with no additives. However, they taste completely different, the Now being very acidic and the Wellness having no acidity and more like ground chalk. I have no idea which is right and whether I should keep taking the new supply or whether I have been fooling my self with the last. Any suggestions as to which might be the right one welcomed?