USP and other certifications are supposed to address this, but the onus is on the consumer to seek out the certification label. http://www.usp.org/verification

USP and other certifications are supposed to address this, but the onus is on the consumer to seek out the certification label. http://www.usp.org/verification-services/verified-mark http://www.usp.org/verification-services/verified-mark Others include NSF, UL, and consumerlab https://www.consumerreports.org/vitamins-supplements/what-usp-verified-and-other-supplement-seals-mean/ https://www.consumerreports.org/vitamins-supplements/what-us... There's still the chance that a manufacturing mistake could result in bad dosage but that applies to all products including medicine.