naturalfactors.com Bewertungen 

I have been taking vitamins for most of my adult life. Natural factors is a brand I use a fair amount. I’ve known some friends who work there and have given me insight on them. They are trustworthy. They use third party testing and are very high on consumer reviews. China produces almost all of the vitamin C in the world so I don’t what the other guys comment is about. Products must be made somewhere, it’s better to judge companies on their testing to ensure quality rather than make a blanket statement about a country, haven’t we learned from our politicians????
Anyway, I have looked for a top quality Curcumin product and I have found their Theracurmin the best out there. So I’m sticking with my friends and my gut, I’ll continue to use them. I also trust private companies more than public ones who seem to only care about their bottom line.

They use ingredients and chemicals sourced from China. In fact ALL the different Vitamin companies in usa and canada are using ingredients and chemicals from China. Unfortunately China has a bad quality control record. Go on the internet and Read about chemical recall called Melamine. Read about blood pressure drug called Valsartan contaminated with N-nitrosodimethylamine. Read about drug recall from Edge Pharma, LLC. Read about the FDA warning letter about Vitamin B12 contamination from company called Hebei Yuxing Bio-Engineering. Personally I have chosen to stop taking all Vitamins and I'm trying to just eat better food. Also 95% of the world's Vitamin C is made in China so avoid food which contains added "Ascorbic Acid" and avoid food which has added Vitamins, because they are made in China. AND Just so you don't think the wrong thing about me, I am stating here that I like the Chinese people, but the quality control on their products and their government, is what I don't like.