ORIGINAL DR. CLARK PRODUCT - Self Health Resource Center (SHRC) is the Original Manufacturer of Dr. Clark's products since 1993, now sold under the brand Dr. Clark Store . Dr. Clark personally instructed our teams how to manufacture her products. All our products are still manufactured and tested per Dr. Hulda Clark's protocols. Avoid imitations! GMP CERTIFIED MANUFACTURING - Our factory is GMP certified and audited by world leading quality control organizations and FDA registered. TESTING PER GMP - Carefully sourced from the best raw materials available and triple tested by (1) our own GMP audited laboratory (2) manufacturers lab (3) Dr. Clark's auxiliary testing. Tested for identity, purity, finished good testing (plus potency testing when potency is indicated on label). Finished goods testing (after products have been packaged) ensures your safety! HYPOALLERGENIC - All our Dr. Clark Store branded products are preservative free, gluten-free, milk-free, and GMO free. We are also nut free (except for those made from the young green hulls of black walnuts). EXCIPIENT FREE - We don't use magnesium stearate, artificial colorings, coatings, binders, fillers, or release agents in any of our products. Not now - not ever!