Label data: what’s really in each capsule
The big number on the front of the bottle and the amount in each capsule are often different. We checked the Supplement Facts of popular Amazon products one by one. Every table can be downloaded as CSV.
How much magnesium is really in each capsule?We checked 68 popular magnesium supplements for elemental magnesium per capsule — glycinate vs citrate vs oxide vs threonate, and how many capsules make 200 mg.See the data →How much EPA + DHA is really in each fish oil capsule?We checked 58 popular omega-3 and krill oil supplements for EPA + DHA per capsule and purity — and how many capsules it takes to reach 1,000 mg a day.See the data →Vitamin D supplements: how many IU per capsule, and how many go over the limit?We checked 48 popular vitamin D supplements: IU per capsule, label daily dose vs the 4,000 IU upper limit, IU to mcg, and which K2 form is used.See the data →Probiotics: is the CFU count guaranteed at manufacture or through expiration?We checked 47 popular probiotics against NIH label records: CFU per day, whether the count is guaranteed through expiration, and whether strains are numbered.See the data →