The first day I took Bioperine I in the morning, with my vitamins and with my treatment (designed for regulate my heart beats). My pulses decreased falling from 60 to 48. SO ... What I'm saying here is there was a side effect because my treatment was more efficient and every one who's taking piperine extract should be aware of that. And obviously, Bioperine is increasing bio availibility, and here's a proof it's working on a larger scale. As for a secondary benefit, I'm taking now half a pill of my treatment and it seems to be working properly. So just take care and be aware it could happen for you on molecules you're taking for your desease, not only vitamins are concerned here. Bioperine is doing exactly what it's designed for, perhaps too much better, that's why I rated 5 stars.
Posted by trefoglio on Jun 28, 2012 | Verified Purchase
BioPerine is absorber of curcumin from turmeric. However, this product contain magnesium stearate that is not healthy and can in fact make absorption of all nutrients more difficult. I'm currently looking for BioPerine without magnesium stearate.
Posted by iHerb Customer on Dec 29, 2016 | Verified Purchase
It gave me stomach pain.
Posted by iHerb Customer on Dec 01, 2016 | Verified Purchase
A rip off
Posted by iHerb Customer on Dec 15, 2012 | Verified Purchase
like my title review, i feel it didn't do much of anything. I didn't feel any extra absorption of my daily supplement when i take this product. I learned to get the best absorption, eat breakfast then take your supplements.
1-4 of 4 total