Here’s what consumers have asked with answers from PipingRock staff and previous consumers.
Best I've found is MSM Sulfur by piping rock. When I run out and don't take for a few days I can tell a big difference.
I find it above standard. I have been using PR for years and only one time did I have a problem with a product. They refunded and dropped the item from their website. They only carry quality products.
This company has the laziest customer service department. They shipped my order to the wrong address, and wanted ME to rectify the problem. THEY SHIPPED IT! I called and asked them to have the order returned to them, and when they refused, I disputed the charge with american express. When I placed a second order, they canceled it. I WILL NOT WASTE ANY MORE OF MY TIME ON PLACING ORDERS WITH THIS COMPANY AND SUGGEST THAT YOU STAY AWAY.