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iHerb Customer Reviews



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  • Due to Japanese Custom’s regulations, a maximum of one bottle per order can be imported.

  • Reviews | English
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    i had side effects with this

    Posted by Reviewer2991923 on Jul 04, 2009

    it gave me headaches and stomache aches

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    Posted by Reviewer2502251 on Mar 11, 2010

    It makes me really nauseous. Im taking 1 on an empty stomach as directed. I may be just super sensitive.

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    Posted by Reviewer3345414 on Apr 28, 2011

    I used the NOW brand but thought this one was a better bargain. It's cheaper, yes, and inferior. I'll be going back to NOW.

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    Not what I expected

    Posted by Reviewer3122150 on Jul 30, 2012

    I started taking these because I was hoping to improve my mood that my husband claimed was bad all the time. These, unfortunately, made it very hard to get out of bed in the morning and once I did, I felt like I was in a fog most of the day. I decided to take them earlier in the day, before dinner, but the sleepiness and fogginess did not improve. I think this is probably a supplement for people who are really stressed out and that's not me.

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    Doesn't seem to work

    Posted by Reviewer3294199 on Mar 22, 2010

    Doesn't seem to work as well as other 5-HTP suppliments I have tried.

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    Posted by Reviewer2298873 on Oct 13, 2011


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    increase in blood pressure

    Posted by estranged on Aug 09, 2012

    this product increased my blood pressure and heart rate so I had to stop it.

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    Use with caution

    Posted by Reviewer2765237 on Sep 28, 2015

    Gave me diarrhea. I took I capsule per day and after a week of surprise diarrhea attacks decided to quit. Could be the serotonin effect....

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    Better to take Natrol's Time Release

    Posted by 4998413820675525348 on Nov 13, 2015

    I've had a sleep disorder (poor-time generation!) for the longest time and found that Melatonin+5 HTP as a combo did me the trick. I was on Natrol's 5HTP time release before I tried this as I figured I'd save monies by buying this instead. Sad thing was, I then realised that this does NOT work for me. I didn't sleep as deep as I would before and had this tiring mornings as if I had a hangover and have been in the worse mood this year. I'm switching back to Natrol TR Melatonin and Natrol TR 5-HTP. Consult your doctor before you take anything!

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    Items 1-9 of 9 total