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 iHerb Customer on June 16 2010 | Verified Purchase
This stuff made me woosy to the point that I couldn't take it anymore.
Posted by iHerb Customer on November 11 2008 | Verified Purchase
Bioperine (piperine) makes me feel slightly sick. I've experimented a few times, separated by months. I'll be avoiding it in the future.
Posted by iHerb Customer on June 21 2011 | Verified Purchase
I tried half a tablet and broke out in severe headache. I think I don't need these.
Posted by iHerb Customer on July 15 2017 | Verified Purchase
I am using "0" empty capsules and fill them with ground black pepper instead. These are just too weak in potency in my opinion. Would have to take at least 4 with my Pregnenolone to feel them working.
Posted by iHerb Customer on November 24 2013 | Verified Purchase
Not sure about this supplement. I took it mostly for enhancing the absorption of other supplements, but I didn't noticed something different.
Posted by iHerb Customer on December 18 2012 | Verified Purchase
I cant feel any difference when i use this product.Maybe the effect is too subtile.
Posted by iHerb Customer on September 12 2011 | Verified Purchase
The first time I tried, they upset my stomach so I stopped after about 5 days. I will try them again after I get back from a long business trip. From my current experience, I can only rate it as 2 star.
Posted by iHerb Customer on January 5 2016 | Verified Purchase
It's hard to tell wether these work or not since they don't have much effect on their own. I can take three at once, no heat and no noticable difference from other supplements. They're cheap though, so it doesn't hurt to giv'em a try.
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