Labdoor analyzed 6 of the best-selling vitamin B6 supplements in the United States for vitamin B6 content and heavy metal (arsenic, cadmium, lead, mercury) contamination.
Overall, products performed well in label accuracy - measured vitamin B6 content deviated from label claims by an average of 1%. On average, products contained 176 mg of vitamin B6 per serving, ranging from 26.7 mg to 521 mg.
The Recommended Daily Allowance (RDA) of vitamin B6 to prevent deficiency-related symptoms is 1.3 mg for adults up to 50 years of age, and then 1.7 mg for males and 1.5 mg for females 51 years of age or older1. Taking more than the RDA of vitamin B6 has shown some benefits for pregnancy-induced nausea and vomiting, premenstrual syndrome (PMS), and in older adults, mental health.
Analytical Chemistry Methods: CE (vitamin B6); ICP-MS (arsenic, cadmium, lead, mercury).
All 6 products tested passed testing for lead, cadmium, arsenic, and mercury contamination. This means that one serving of the products analyzed were shown to be under daily limits set by the United States Pharmacopeia.