How do I know what brands of supplements have the potency correctly stated on the bottle?

I have heard of and seen programs where they test certain brands of vitamins and other supplements sold in drug stores. On these programs they ‘expose’ brands as not having in the ‘pill’ what the brands say they have.
For example, a glucosamine capsule which advertises 1500 units on the bottle may only have 1000. [...]

Tags: , , , , ,