Helps maintain serotonin levels for healthy mood. Also supports natural, restful sleep. How Does NSI® L-Tryptophan work? L-tryptophan is an essential amino acid—meaning the body does not produce it on its own; it must be obtained through diet. It's found in small amounts in nuts, grains, beans, legumes, cheese, eggs, and meat. L-tryptophan breaks down into four different metabolites in the body. Most notably, it's converted to 5-HTP, which is then converted to serotonin—a neurotransmitter that helps regulate mood, sleep and appetite. Low serotonin levels in the brain are associated with poor mental health and sleep disturbances. Supplementing with L-tryptophan may help raise serotonin levels, promoting better mood, relaxation and rest. In addition, L-tryptophan is broken down into melatonin, a hormone that regulates the body's sleep-wake cycle, and the B-vitamin, niacin, which helps maintain healthy function of the nervous system, digestive system and skin. L-tryptophan also plays a part in the production of compounds called kynurenines, which have been found to suppress immune response, an effect that may benefit those with overactive immune function. NSI® L-Tryptophan is better because it:. Delivers 500 mg of pure L-tryptophan in one one-capsule serving. Is safe for vegetarians.
Average Customer Rating:
4.6 out of 5
32 of 34 (94%) customers would recommend this product to a friend.
Customer Reviews for NSI L-Tryptophan -- 500 mg -120 Capsules
Overall Rating:
5
out of 5
Works Well,
August 19, 2008
By Azraelfrom New York
Value:
5
out of 5
Quality:
5
out of 5
Effectiveness:
5
out of 5
Satisfaction:
5
out of 5
"Great product, but may take time to know when to take it so your are not gorggy. Take an energy booster with it."
Age:
25-34
Gender:
Male
Daily supplement usage:
3-5 supplements daily
Referral source:
Self-referred
Reason for usage:
Specific health concern
Duration of use:
30-60 days
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Review 2 for NSI L-Tryptophan -- 500 mg -120 Capsules
Top 25 Contributor
Overall Rating:
5
out of 5
Dynamic duo,
July 30, 2008
By pridefcfrom Indiana
Value:
5
out of 5
Quality:
5
out of 5
Effectiveness:
5
out of 5
Satisfaction:
5
out of 5
"The best thing is that L-Tryptophan won't disrupt your delicately balanced sleep-wake cycle and actually works. From my many years of nutritional medicine research L-Tryptophan's antidepressant effects can be greatly enhanced by taking L-Tyrosine. You don't want lopsided neurotransmission. L-Tryptophan increases serotonin which, over time, can decrease dopamine/norepinephrine levels so I highly recommend adding L-Tyrosine during the day to acheive mental health balance. With this dynamic duo I haven't had a low mood in years."
Age:
35-44
Gender:
Male
Daily supplement usage:
3-5 supplements daily
Referral source:
Self-referred
Reason for usage:
Promote overall health
Duration of use:
Less than 30 days
Share this Review:
Review 3 for NSI L-Tryptophan -- 500 mg -120 Capsules
Overall Rating:
5
out of 5
Natural Mood Lift,
June 1, 2008
By sevenrosesfrom SC
Value:
5
out of 5
Quality:
5
out of 5
Effectiveness:
5
out of 5
Satisfaction:
5
out of 5
"I love this product. Immediately after taking it I find myself sighing and relaxing. My mind becomes calm and focused and I feel much more present and uplifted. Its helped me sleep better and stay more centered during the day. I started taking it several times per day several weeks ago. I now find I only need it a couple times a day."
Age:
45-54
Gender:
Female
Daily supplement usage:
6+ supplements daily
Referral source:
Other
Reason for usage:
Specific health concern
Duration of use:
61-180 days
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Review 4 for NSI L-Tryptophan -- 500 mg -120 Capsules
Top 500 Contributor
Overall Rating:
5
out of 5
Wonderful Sleep Helper,
May 20, 2008
By scrubbrushfrom Sunnyvale, CA
Value:
5
out of 5
Quality:
5
out of 5
Effectiveness:
5
out of 5
Satisfaction:
5
out of 5
"This product works great when I start taking it within 2-3 hours of settling in to sleep. It's not for taking right before falling in the sack, as it does take a bit of time to work. The resulting sleep is great, deep sleep, as long as I go to bed when I feel ready. One thing I've found with this product is once it starts kicking in and I feel drowsy, there is a short window of time when I have to go to bed and go to sleep or else I get quite cranky and then seem to have even more trouble sleeping. So, it's for serious sleepers."
Age:
35-44
Gender:
Female
Daily supplement usage:
6+ supplements daily
Referral source:
Self-referred
Reason for usage:
Specific health concern
Duration of use:
61-180 days
Share this Review:
Review 5 for NSI L-Tryptophan -- 500 mg -120 Capsules
Overall Rating:
4
out of 5
Thumbs up,
February 25, 2008
By j75080from Dallas, TX
Value:
4
out of 5
Quality:
4
out of 5
Effectiveness:
4
out of 5
Satisfaction:
4
out of 5
"Good product at good price."
Age:
55-64
Gender:
Male
Daily supplement usage:
1-2 supplements daily
Referral source:
Other
Reason for usage:
Specific health concern
Duration of use:
30-60 days
Share this Review:
Review 6 for NSI L-Tryptophan -- 500 mg -120 Capsules
Overall Rating:
5
out of 5
Insomnia relief,
February 9, 2008
By fernfrom Colorado
Value:
5
out of 5
Quality:
5
out of 5
Effectiveness:
5
out of 5
Satisfaction:
5
out of 5
"I've had insomnia for over 10 years, but the combination of this product (3 caps) along with Standard Process Lab's Min-Tran has allowed me to sleep normally again after years of searching for a solution."
Age:
45-54
Gender:
Female
Daily supplement usage:
6+ supplements daily
Referral source:
Other
Reason for usage:
Specific health concern
Duration of use:
Over 180 days
Share this Review:
Review 7 for NSI L-Tryptophan -- 500 mg -120 Capsules
Overall Rating:
5
out of 5
L-Tryptophan,
February 6, 2008
By Busybeafrom Lubbock, TX
Value:
5
out of 5
Quality:
5
out of 5
Effectiveness:
5
out of 5
Satisfaction:
5
out of 5
"Got this product to see if it would help with my sleep problems. Works very well and am very satisfied with it. Also helps to curb my appetite. Found that taking it about 6:30 every evening really helps me get a good nights sleep. Saw this product in the Vitacost catalogue and decided to give it a try."
Age:
65-74
Gender:
Female
Daily supplement usage:
1-2 supplements daily
Referral source:
Other
Reason for usage:
Promote overall health
Duration of use:
Over 180 days
1 of 1 people found this review helpful.
Share this Review:
Review 8 for NSI L-Tryptophan -- 500 mg -120 Capsules
Overall Rating:
5
out of 5
SLEEP,
October 27, 2007
By azbigbirdfrom ARIZONA
Value:
5
out of 5
Quality:
5
out of 5
Effectiveness:
5
out of 5
Satisfaction:
5
out of 5
"I USE THIS FOR SLEEP. FIRST USED ABOUT 25 YEARS AGO AT A PAIN AND STRESS CENTER. I HAVE HAD GREAT RESULTS"
Age:
55-64
Gender:
Male
Daily supplement usage:
6+ supplements daily
Referral source:
Physician
Reason for usage:
Specific health concern
Duration of use:
Over 180 days
Share this Review:
Review 9 for NSI L-Tryptophan -- 500 mg -120 Capsules
Overall Rating:
4
out of 5
October 16, 2007
By flyboy
Value:
5
out of 5
Quality:
4
out of 5
Effectiveness:
4
out of 5
Satisfaction:
4
out of 5
"NSI provides a growing numbe of products that are competitively priced. I'm using them frequently for specific items such as L-Tryptophan."
Share this Review:
Review 10 for NSI L-Tryptophan -- 500 mg -120 Capsules
Overall Rating:
5
out of 5
Satisfied,
October 10, 2007
By Waynefrom Omaha, NE
Value:
5
out of 5
Quality:
5
out of 5
Effectiveness:
5
out of 5
Satisfaction:
5
out of 5
"I am pleased to be taking this product along with Omega 3 fish oil. I have been on differing amounts of SSRIs for seven years, so now I am very happy to find help in natural products. I only wish I had known of them sooner. If you have trouble with serotonin levels too, you must try this. It is helping me!"
Age:
55-64
Gender:
Male
Daily supplement usage:
3-5 supplements daily
Referral source:
Self-referred
Reason for usage:
Specific health concern
Duration of use:
30-60 days
1 of 1 people found this review helpful.
Share this Review:
Review 11 for NSI L-Tryptophan -- 500 mg -120 Capsules
Overall Rating:
5
out of 5
Sound Sleep use Tryptophan,
October 9, 2007
By Joanna
Value:
5
out of 5
Quality:
5
out of 5
Effectiveness:
5
out of 5
Satisfaction:
5
out of 5
"This product has helped me fall asleep faster and deeper naturally. No morning side effects or any side effects at all. I take 3 tabs every night."
1 of 1 people found this review helpful.
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Review 12 for NSI L-Tryptophan -- 500 mg -120 Capsules
Overall Rating:
5
out of 5
L-Tryptophan really does help you sleep.,
October 1, 2007
By Titmousefrom Washington DC
Value:
5
out of 5
Quality:
5
out of 5
Effectiveness:
5
out of 5
Satisfaction:
5
out of 5
"This essential amino acid, working as a chemical precursor of serotonin, helps you sleep. I keep it beside my bed. NSI's 500mg capsules deliver it economically with no discernable, unwanted side effects. I will be buying more."
Age:
55-64
Daily supplement usage:
1-2 supplements daily
Referral source:
Friend
Duration of use:
Over 180 days
Share this Review:
Review 13 for NSI L-Tryptophan -- 500 mg -120 Capsules
Overall Rating:
2
out of 5
Not for me!,
October 1, 2007
By naturalnut
Value:
5
out of 5
Quality:
2
out of 5
Effectiveness:
2
out of 5
Satisfaction:
2
out of 5
"This product was much to strong for me... it made my heart race therfore I was up all night."
1 of 2 people found this review helpful.
Share this Review:
Review 14 for NSI L-Tryptophan -- 500 mg -120 Capsules
Overall Rating:
5
out of 5
A good night's sleep,
September 11, 2007
By 4Dobes
Value:
5
out of 5
Quality:
5
out of 5
Effectiveness:
5
out of 5
Satisfaction:
5
out of 5
"Gentle and effective. Finally a good night's sleep."
Share this Review:
Review 15 for NSI L-Tryptophan -- 500 mg -120 Capsules
Overall Rating:
4
out of 5
Very pleased,
July 19, 2007
By clong
Value:
4
out of 5
Quality:
5
out of 5
Effectiveness:
4
out of 5
Satisfaction:
5
out of 5
"After taking benedryl for months to help with sleep, I tried this. It makes me feel kind of dizzy, but as long as I take it and lay down within a few minutes it does help with sleep. Keeps me asleep too. I no longer need the benedryl."
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Review 16 for NSI L-Tryptophan -- 500 mg -120 Capsules
Overall Rating:
5
out of 5
I Love It,
July 12, 2007
By GodsGirl7
"This is an excellent product! It promotes a very restful sleep and I feel great the next day! I would highly recommend this product for great sleep and for mood support. I'll keep buying this product at this great price! Thanks, Vitacost."
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Review 17 for NSI L-Tryptophan -- 500 mg -120 Capsules
Overall Rating:
4
out of 5
Seems Just OK,
June 22, 2007
By EastSider
Value:
4
out of 5
Quality:
4
out of 5
Effectiveness:
4
out of 5
Satisfaction:
4
out of 5
"The effectiveness of these seems slightly weeker than another brand that I used previously. They do, however, work the way they should."
Share this Review:
Review 18 for NSI L-Tryptophan -- 500 mg -120 Capsules
Overall Rating:
5
out of 5
June 20, 2007
By Strangerfrom TEXAS
Value:
5
out of 5
Quality:
5
out of 5
Effectiveness:
5
out of 5
Satisfaction:
5
out of 5
"This is excellent after a stressful day or a restless night with too much on the mind. I do not take it everyday just when I need a little extra help to relax."
Age:
35-44
Gender:
Male
Referral source:
Other
Reason for usage:
Promote overall health
Duration of use:
Less than 30 days
Share this Review:
Review 19 for NSI L-Tryptophan -- 500 mg -120 Capsules
Overall Rating:
5
out of 5
Just what I needed,
May 14, 2007
By Dusty
Value:
5
out of 5
Quality:
5
out of 5
Effectiveness:
5
out of 5
Satisfaction:
5
out of 5
"I've been struggling with going to sleep for years. This product truly speeds up that process, helping me to fall to sleep much sooner than without it. I don't want to run out!"
1 of 1 people found this review helpful.
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Review 20 for NSI L-Tryptophan -- 500 mg -120 Capsules
Top 500 Contributor
Overall Rating:
5
out of 5
Never Live Life Without It!,
May 7, 2007
By nikkipikki
Value:
5
out of 5
Quality:
5
out of 5
Effectiveness:
5
out of 5
Satisfaction:
5
out of 5
"I was not sleeping well, was a hormonal mess during the day. Just overall mentally exhausted. This brought life back to me. I'm sleeping better than ever; have lots of energy and feel peaceful in mind. I love this product."
Age:
25-34
Gender:
Female
Daily supplement usage:
6+ supplements daily
Referral source:
Self-referred
Reason for usage:
Specific health concern
Duration of use:
Over 180 days
