I too just stumbled upon this conversation. Magnesium Oil is indeed a wonderful product. I have used it time and again. I find it almost a miracle cure for me. As for brands, I like to always try buying American Made. I have found Genuine Permian Era mineral magnesium oil here in the US. It is from the same geological period in time as the Zechstien sea. I have seen side by side comparisons of certificates of analysis. I can not tell any difference at all, in terms for use. This product is great, the company is great and its owner seems very genuine and willing to talk. Check the site out, they have the lab tests listed. They do other fantastic liquid ionic minerals too; http://www.mineralifeonline.com/pd-magnesium-oil-8oz.cfm