--- product_id: 3810651 title: "Source Naturals L-Tryptophan, for Mood, Relaxation, and Sleep*, 500mg - 120 Capsules" brand: "source naturals" price: "€ 33.58" currency: EUR in_stock: true reviews_count: 3 category: "Source Naturals" url: https://www.desertcart.hr/products/3810651-source-naturals-l-tryptophan-for-mood-relaxation-and-sleep-500mg store_origin: HR region: Croatia --- # 500mg pure L-Tryptophan per capsule Supports deep, restful sleep Boosts immune regulation naturally Source Naturals L-Tryptophan, for Mood, Relaxation, and Sleep*, 500mg - 120 Capsules **Brand:** source naturals **Price:** € 33.58 **Availability:** ✅ In Stock ## Summary > 💼 Unlock your best mood and sleep—because thriving never goes out of style. ## Quick Answers - **What is this?** Source Naturals L-Tryptophan, for Mood, Relaxation, and Sleep*, 500mg - 120 Capsules by source naturals - **How much does it cost?** € 33.58 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/3810651-source-naturals-l-tryptophan-for-mood-relaxation-and-sleep-500mg) ## Best For - source naturals enthusiasts ## Why This Product - Trusted source naturals brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Sleep Like a CEO:** Experience restorative, deep sleep that powers your productivity and sharpens your focus for the day ahead. - • **Immune System Ally:** Supports your body's natural defenses by regulating immunity through kynurenine pathways. - • **Trusted Quality Since 1982:** Crafted in the USA under strict FDA cGMP standards for purity and potency you can rely on. - • **Mood & Relaxation Amplified:** Elevate your daily calm with a natural serotonin precursor that helps melt away stress and anxiety. - • **Flexible Dosing for Your Lifestyle:** Take 1 capsule thrice daily or up to 3 before bed to customize your relaxation and sleep routine. ## Overview Source Naturals L-Tryptophan delivers 500mg of a vital amino acid per capsule, clinically supporting mood balance, relaxation, and deep sleep. Manufactured in the USA under FDA cGMP guidelines, this supplement also aids immune function by regulating kynurenines. Trusted for over 40 years, it offers a natural, effective alternative to pharmaceutical options, perfect for professionals seeking holistic wellness and peak performance. ## Description desertcart.com: Source Naturals L-Tryptophan, for Mood, Relaxation, and Sleep*, 500mg - 120 Capsules : James, Tommy: Health & Household Review: How the hell did I not know about this before? - I know that's a funny title, but seriously, how the hell did I not??? I was a child with OCD and I have been an adult with OCD and anxiety. I'm also sort of a naturalist and very anti-pharmaceutical. I don't care what anyone says, but this country is driven by "quick fixes" and "happy pills," which of course NEVER solve the problem. I can honestly say that this supplement has saved me in every way that I needed to be saved. I could not for the life of me figure out why my anxiety got worse as an adult where I started having panic attacks and then fearing that I would have panic attacks which brought on more panic attacks. I won't be a hypocrite. I have a script for Xanax but I RARELY take it. When used on occasion, it is a brilliant med, but I don't want to need to take it. I first tried 5-HTP and I'm a very happy person so when I started getting really agitated, I knew something was weird. Then, I read a bunch of reviews where you aren't supposed to drink within 6 hours of taking it and you shouldn't take Ibuprofen. So, essentially, you aren't supposed to live a real life or get cramps or headaches because just have to suffer through them. If I received major benefit from it, I would have gone ahead and taken it. After getting moody, I look again at the reviews for L-Tryptophan. I can honestly say that this has CHANGED ME! No more panic. Sleeping amazingly. I'm not stressed. I hardly have any anxiety. Where have you been all my life, L-Tryp... seriously??? I have friends that are on SSRI's AND Benzos daily and they STILL have panic attacks. If ALL of that medication isn't at least getting rid of your issues, why the hell would you continue to take it and say to yourself, "This seems very wrong..." After having anxiety daily and panic attacks often and literally beginning to question doing things because I didn't want to have panic, I knew that I needed to find SOMETHING to help me or I would literally be nuts by the time I was 40. Friends, this seriously have saved me. I have tried a LOT of stuff (I mean A LOT), but in getting to the root of my stuff (OCD/anxiety), I figured that low serotonin was the bottom line. It would seem then that raising my serotonin levels naturally would be key. I cannot say enough how amazing this product has been. I wish I could give it 10 stars and an Academy Award! Thank you, Source Naturals for making an excellent product. I will be buying a lifetime supply! UPDATE: it's over a month later and I haven't had a panic attack or taken Xanax once!! I think it's a combo of working with your thoughts as well but I really do believe in this product. Review: Useful At All Ages - I have done a serious study of supplements. L-Tryptophan is an essential amino acid for humans. Essential means that the body does not make it and it has to come from food. Amino Acids are the building blocks of proteins. To make protein we need amino acids. The 'L' in L-Tryptophan stands for the Latin 'Levo' or Left as opposed to Dextro for Right. L-Tryptophan means Left-Tryptophan as its molecular structure has something to do with left. Not relevant in here, except to note that L-Tryptophan is better absorbed in the human body than Tryptophan. We do not get enough Tryptophan in our diet, so supplements are essential. Eating more turkey is still not enough. Typically taken at nighttime for good sleep. Source Naturals is a very good vitamin manufacturer, and to be trusted. L-Tryptophan balances the brain chemicals, and it is my belief from my reading and study that a lot of anxiety, bi-polar disorders, and such can be alleviated or perhaps cured in the long run with use of this supplement. It can be taken in small doses during daytime too, but does make you a bit drowsy. Not like a sleeping pill, this is more natural. Lack of Tryptophan in the body has bad consequences long term. I have found that my sleep becomes deep and restful with use. I take 2 of these capsules 30 minutes before bedtime. I also occasionally use 3 mg of Melatonin (Ultra Melatonin from Costco is best), which replenishes missing Melatonin due to age. Melatonin is a super hormone triggering the release of a lot of other hormones in the body and very necessary to push back the decay and 'aging' of the human body. Also helps reset your bio-clock from travel or bad sleep habits, and makes the body youthful. If you are over 40 you need to get some of this. If you know of ADHD kids, schizophrenics, bi-polar people, depressives, anxiety prone people, advise them to take some too. It may have amazing results on them. I am not a doctor, but passing on my experience and study to others. Please rely on your doctor's medical advice in all matters, however, note that doctors in the US do not get a single course on nutrition or holistic health in their entire course of study, so many of them do not know how to boost the body naturally or diagnose deficiencies in the body. Drugs are not always the long term solution. ## Features - The essential amino acid l-tryptophan helps support relaxation, restful sleep, and positive mood.* - l-Tryptophan also supports immune functions because it is the body’s precursor to the kynurenines that regulate immunity. - Suggested Use: 1 capsule three times daily, between meals and preferably with fruit juice. To support restful sleep, take an additional 3 capsules before bed.* - Over 40 Years of Trust. Source Naturals was created in 1982 by CEO Ira Goldberg to support everyone’s potential to enjoy optimal health. - Manufactured in the USA. Manufactured in Scots Valley, CA, under the Good Manufacturing Practices (cGMPs) established by the US Food and Drug Administration (FDA). ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B000GFSVS2 | | Best Sellers Rank | #28,959 in Health & Household ( See Top 100 in Health & Household ) #311 in Herbal & Nutritional Sleep Supplements #2,155 in Sales & Deals | | Customer Reviews | 4.4 4.4 out of 5 stars (1,928) | | Date First Available | July 19, 2004 | | Department | Health and Beauty>Health and Wellness | | Is Discontinued By Manufacturer | No | | Item model number | SN1985 | | Manufacturer | Threshold Enterprises | | Product Dimensions | 2.51 x 2.51 x 4.6 inches; 1.6 ounces | ## Product Details - **Brand:** Source Naturals - **Diet Type:** Gluten Free - **Flavor:** Unflavored - **Item Form:** Capsule - **Item Weight:** 0.1 Pounds - **Item dimensions L x W x H:** 2.51 x 2.51 x 4.6 inches - **Primary Supplement Type:** L-Tryptophan - **Product Benefits:** Restful Sleep,Support - **Special Ingredients:** L-Tryptophan - **Unit Count:** 120.0 Count ## Images ![Source Naturals L-Tryptophan, for Mood, Relaxation, and Sleep*, 500mg - 120 Capsules - Image 1](https://m.media-amazon.com/images/I/71VMT7Lk+EL.jpg) ## Available Options This product comes in different **Size, Item Package Quantity** options. ## Questions & Answers **Q: How many milligrams per tablet?** A: 500mg each. I typically only need 1. Remember these tips for use. This is a protein precursor so you will not show much affect if you have eaten protein recently. Eat dinner a few hours before bed, and take the Tryptophan about 30 minutes before you need to sleep. This like all amino acids function much better when you add a B-Vitamin complex to it as a transport mechanism. **Q: Why is their no indication of the source of this tryptophan? Where does it come from?** A: I need to know the source also. I had been taking 5-HTP, but my body can't tolerate it. 5-HTP is made from an African legume, and I've noticed that legumes cause fibro-like inflammation in my muscles. (My father had gout. I don't have the gout, but I can't tolerate anything derived from a bean.) From time to time, I have had problems with certain supplements. Knowing the source before I buy is a necessary thing for me also. **Q: What is listed as "other ingredients"?** A: Other Ingredients: gelatin (capsule), dibasic calcium phosphate, mycrocrystaline cellulose, silica, and magnesium stearate. Also, listed with the L-Tryptophan is Iron (naturally occurring) 575 mcg which it indicates is 3%DV of daily need. But the DV is according to the FDA I'm sure. After my husband passed away, I found some of this in his things. I took some and found it helped me get through this and also get sleep at night. **Q: What is the source of the dextrose used for this tryptophane? Is it made in China?** A: As you can see from the company, their ingredients are sourced from China. Kudos to them for being honest. Unfortunately, beets and corn, especially from China, are GMO. No thanks. The search for a company that puts consumer health over profit goes on! ## Customer Reviews ### ⭐⭐⭐⭐⭐ How the hell did I not know about this before? *by K***. on January 30, 2014* I know that's a funny title, but seriously, how the hell did I not??? I was a child with OCD and I have been an adult with OCD and anxiety. I'm also sort of a naturalist and very anti-pharmaceutical. I don't care what anyone says, but this country is driven by "quick fixes" and "happy pills," which of course NEVER solve the problem. I can honestly say that this supplement has saved me in every way that I needed to be saved. I could not for the life of me figure out why my anxiety got worse as an adult where I started having panic attacks and then fearing that I would have panic attacks which brought on more panic attacks. I won't be a hypocrite. I have a script for Xanax but I RARELY take it. When used on occasion, it is a brilliant med, but I don't want to need to take it. I first tried 5-HTP and I'm a very happy person so when I started getting really agitated, I knew something was weird. Then, I read a bunch of reviews where you aren't supposed to drink within 6 hours of taking it and you shouldn't take Ibuprofen. So, essentially, you aren't supposed to live a real life or get cramps or headaches because just have to suffer through them. If I received major benefit from it, I would have gone ahead and taken it. After getting moody, I look again at the reviews for L-Tryptophan. I can honestly say that this has CHANGED ME! No more panic. Sleeping amazingly. I'm not stressed. I hardly have any anxiety. Where have you been all my life, L-Tryp... seriously??? I have friends that are on SSRI's AND Benzos daily and they STILL have panic attacks. If ALL of that medication isn't at least getting rid of your issues, why the hell would you continue to take it and say to yourself, "This seems very wrong..." After having anxiety daily and panic attacks often and literally beginning to question doing things because I didn't want to have panic, I knew that I needed to find SOMETHING to help me or I would literally be nuts by the time I was 40. Friends, this seriously have saved me. I have tried a LOT of stuff (I mean A LOT), but in getting to the root of my stuff (OCD/anxiety), I figured that low serotonin was the bottom line. It would seem then that raising my serotonin levels naturally would be key. I cannot say enough how amazing this product has been. I wish I could give it 10 stars and an Academy Award! Thank you, Source Naturals for making an excellent product. I will be buying a lifetime supply! UPDATE: it's over a month later and I haven't had a panic attack or taken Xanax once!! I think it's a combo of working with your thoughts as well but I really do believe in this product. ### ⭐⭐⭐⭐⭐ Useful At All Ages *by M***E on May 17, 2014* I have done a serious study of supplements. L-Tryptophan is an essential amino acid for humans. Essential means that the body does not make it and it has to come from food. Amino Acids are the building blocks of proteins. To make protein we need amino acids. The 'L' in L-Tryptophan stands for the Latin 'Levo' or Left as opposed to Dextro for Right. L-Tryptophan means Left-Tryptophan as its molecular structure has something to do with left. Not relevant in here, except to note that L-Tryptophan is better absorbed in the human body than Tryptophan. We do not get enough Tryptophan in our diet, so supplements are essential. Eating more turkey is still not enough. Typically taken at nighttime for good sleep. Source Naturals is a very good vitamin manufacturer, and to be trusted. L-Tryptophan balances the brain chemicals, and it is my belief from my reading and study that a lot of anxiety, bi-polar disorders, and such can be alleviated or perhaps cured in the long run with use of this supplement. It can be taken in small doses during daytime too, but does make you a bit drowsy. Not like a sleeping pill, this is more natural. Lack of Tryptophan in the body has bad consequences long term. I have found that my sleep becomes deep and restful with use. I take 2 of these capsules 30 minutes before bedtime. I also occasionally use 3 mg of Melatonin (Ultra Melatonin from Costco is best), which replenishes missing Melatonin due to age. Melatonin is a super hormone triggering the release of a lot of other hormones in the body and very necessary to push back the decay and 'aging' of the human body. Also helps reset your bio-clock from travel or bad sleep habits, and makes the body youthful. If you are over 40 you need to get some of this. If you know of ADHD kids, schizophrenics, bi-polar people, depressives, anxiety prone people, advise them to take some too. It may have amazing results on them. I am not a doctor, but passing on my experience and study to others. Please rely on your doctor's medical advice in all matters, however, note that doctors in the US do not get a single course on nutrition or holistic health in their entire course of study, so many of them do not know how to boost the body naturally or diagnose deficiencies in the body. Drugs are not always the long term solution. ### ⭐⭐⭐⭐⭐ Calm in a capsule *by D***D on July 22, 2025* I’ve tried a few sleep and mood supplements over the years, but this L-Tryptophan from Source Naturals feels like a quiet game-changer. The 500mg dosage is just right—gentle enough to avoid grogginess, but effective enough to help me wind down and sleep more soundly. I started with one capsule in the evening and noticed a subtle shift in my ability to relax. It’s not a knockout pill—it’s more like a soft landing at the end of the day. I also appreciate that it’s vegetarian-friendly and clearly labeled, which makes it easy to trust and recommend. The bottle suggests taking it between meals and with fruit juice, which I found helpful for absorption. It’s now part of my nightly routine, and I wake up feeling more rested and emotionally balanced. ## Frequently Bought Together - Source Naturals L-Tryptophan, for Mood, Relaxation, and Sleep*, 500mg - 120 Capsules - NOW Supplements, NAC (N-Acetyl Cysteine) 600 mg with Selenium, 250 Veg Capsules - NOW Foods Supplements, L-Tyrosine 500 mg, Supports Mental Alertness*, Neurotransmitter Support*, 120 Capsules --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/3810651-source-naturals-l-tryptophan-for-mood-relaxation-and-sleep-500mg](https://www.desertcart.hr/products/3810651-source-naturals-l-tryptophan-for-mood-relaxation-and-sleep-500mg) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-04-23*