i hv been taking 20 mule borax for 3 monthes, 1/4th of teaspoon. my osteoarthritis has diminished slightly, but hv noticed more in effect of increased libido. i found a lab grade sodium borate on amazon. wondering if this would be better/safer to injest than the 20 mule, since i heard it may contain some fillers. and the lab grade is 500g for a price similar to 20 mule. thanks!