Been buying Piping Rock products roughly five times a year for several years. Those products that have consumer measurable characteristics always ring true. No way to know if 600mg advertised really is 600mg. Never had a price conflict between advertised and billed. Piping Rock, price-wise very competitive, gets about half my business, Swanson gets the other half (20 year customer.) Be willing to pay more if all supplement companies were regulated and product contents verified A bit slow to ship Piping Rock shipping to AZ takes six days. Never a delivery fail. I suspect some non-U.S. customers don't get the concept of customs duties or want to blame the company for some other entity's fail.