Top 10 Best 5-htp Pure

of October 2024
1
Best ChoiceBest Choice
Nutricost 5-HTP 100mg, 240 Vegetarian Capsules (5-Hydroxytryptophan) - Non-GMO
Nutricost
Nutricost

10
Exceptional
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2
Best ValueBest Value
FORCE FACTOR 5HTP Sleep Aid and Mood Support Supplement, Extra Strength 5 HTP,
Force Factor
Force Factor

9.9
Exceptional
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3
5HTP Liquid Drops - More Absorbable and Effective Than 5 HTP Capsules (60
Double Wood Supplements
Double Wood Supplements

9.8
Exceptional
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4
Clean Nutraceuticals GABA 750mg 5 HTP 200mg L Tryptophan 500mg L Theanine 200mg
Clean Nutraceuticals
Clean Nutraceuticals

9.7
Exceptional
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5
Quality of Life Pure Balance Serotonin PremiumHelps Boost Serotonin & Cortisol
Quality of Life
Quality of Life

9.6
Exceptional
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6
Micro Ingredients 5-HTP 200mg with Chamomile Flower Extract, 180 Capsules, 2 in
Micro Ingredients
Micro Ingredients

9.5
Excellent
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7
Designs for Health 5-HTP 50mg with Vitamin B6 (P-5-P) - 5-HTP Synergy 50 mg
Designs for Health
Designs for Health

9.4
Excellent
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8
Klaire Labs 5-HTP 50 mg - Hypoallergenic 5-HTP from Griffonia Seed Extract
Klaire Labs
Klaire Labs

9.3
Excellent
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9
Designs for Health 5-HTP 100mg with Vitamin B6 (P-5-P) - 5-HTP Supreme 100 mg
Designs for Health
Designs for Health

9.2
Excellent
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10
Nutricost 5-HTP Powder 25 Grams (300mg Per Serving) - Gluten Free & Non-GMO,
Nutricost
Nutricost

9.1
Excellent
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11
Pure 5-HTP (5-Hydroxytryptophan) Plus GABA Supplement - for Sleep, Mood &
Pure Micronutrients
Pure Micronutrients

9.0
Excellent
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12
Pure Encapsulations 5-HTP 100 mg | 5-Hydroxytryptophan Supplement for Brain,
Pure Encapsulations
Pure Encapsulations

8.9
Very Good
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13
Pure Encapsulations 5-HTP 50 mg | 5-Hydroxytryptophan Supplement for Brain,
Pure Encapsulations
Pure Encapsulations

8.8
Very Good
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14
Pure Encapsulations 5-HTP 100 mg | 5-Hydroxytryptophan Supplement for Brain,
Pure Encapsulations
Pure Encapsulations

8.7
Very Good
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15
5HTP 400mg Capsules | 120 Capsules | 5-HTP Extra Strength Supplement | Non-GMO,
Horbäach
Horbäach

8.6
Very Good
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16
5-HTP 200mg | 120 Vegan Capsules | 5 HTP Supplement to Support Stress Relief,
NutraChamps
NutraChamps

8.5
Good
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17
Superior Labs  5-HTP Worx - 150 mg Pure 5-HTP Plus Potent Serotonin Blend - 90
SuperiorLabs
SuperiorLabs

8.4
Good
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18
NOW Supplements, 5-HTP (5-hydroxytryptophan) 200 mg, Double Strength,
NOW
NOW

8.3
Good
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19
NOW Supplements, 5-HTP (5-hydroxytryptophan) 100 mg, Neurotransmitter Support*,
NOW
NOW

8.2
Good
View on Amazon

About 5-htp Pure

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Nutricost 5-HTP 100mg, 240 Vegetarian Capsules (5-Hydroxytryptophan) - Non-GMO & Gluten Free

Convenient Dosage Each serving contains 100mg of encapsulated 5-HTP for easy integration into your daily routine, with an impressive 240 servings per bottle lasting you up to 8 months.. Vegetarian, Non-GMO, and Gluten Free Formula Designed to meet diverse dietary needs. Transformative Wellness Elevate your well-being with Nutricost's 5-HTP supplement, meticulously crafted for your health and vitality.. Uncompromising Quality Nutricost's dedication to quality is reflected in our sourcing of the finest ingredients, providing you with a superior supplement experience.. Trusted Manufacturing Manufactured in the USA under strict guidelines, our supplements are produced in GMP-compliant and FDA-registered facilities, and each batch is tested by independent, ISO-accredited laboratories to ensure purity and effectiveness..

FORCE FACTOR 5HTP Sleep Aid and Mood Support Supplement, Extra Strength 5 HTP, Natural Sleep Supplement for Adults to Support Calm and Stress Balance, Vegan, Non-GMO, 120 Capsules

HELPS BALANCE MOOD Elevate your mood naturally with Force Factor 5-HTP. Also known as happy pills, every dose is scientifically formulated to support a boost of serotonin for a brighter, happier outlook on life.. PROMOTES RELAXATION DEEP SLEEP With just one easy-to-swallow capsule before bed, youll be able to enjoy more restful and rejuvenating sleep, helping you wake up feeling refreshed and energized. 100 drug free and melatonin free.. SUPPORTS STRESS RESPONSE Thanks to its naturally powerful ability to boost serotonin levels and feelings of calm and wellbeing, 5-HTP helps you balance stress from work, school, and daily responsibilities. Add to cart now. PREMIUM QUALITY VEGAN FRIENDLY With no artificial colors, artificial flavors, or gelatin, you can rest assured that youre choosing a high-quality, better-for-you 5-HTP supplement for your daily health and wellbeing.. MADE IN THE USA Force Factor 5-HTP is made in America in GMP-certified manufacturing facilities to ensure quality and safety. All of our ingredients go through rigorous testing to validate their potency and purity..

5HTP Liquid Drops - More Absorbable and Effective Than 5 HTP Capsules (60 Servings of 50mg 99%+ 5-HTP) Serotonin Supplement for Mood, Sleep, and Relaxation by Double Wood

FEEL THE DIFFERENCE Effects of our 5 HTP drops even at the 50mg dose may be far more noticeable than encapsulated 5 HTP products. SEROTONIN SUPPLEMENT 5 HTP is an amino acid that is converted into serotonin in the brain. This may help support mood and Nighttime. UNIQUE 5-HTP DROPS Double Wood offers the first ever maximum absorption 5 HTP drops that are over 99 5-HTP. Check the supplement fact panel of other 5 HTP supplements, many only offer a 10 product.. TWO MONTH SUPPLY Double Wood offers 60 servings of our 5 HTP supplement per bottle in a convenient dropped format. USA PROUD Our 5 HTP drops capsules are Manufactured in the USA from Globally Sourced Ingredients, Gluten Free, and are Non-GMO.

Clean Nutraceuticals GABA 750mg 5 HTP 200mg L Tryptophan 500mg L Theanine 200mg Ashwagandha 3000mg SAM-e L-Glycine - Mood Support Vitamins for Women and Men with L-Tyrosine - Count

Advanced GABA Supplements For Women and Men - Our product takes a GABA L-Theanine Supplement and Ashwagandha Supplements and combines them in powder form with L-Tryptophan 500mg and a 5-HTP 200mg and the results are amazing. Normal L Theanine Supplement contain smaller dosages like l theanine 100mg and l theanine 150 mg. However, Clean Nutra has officially created an even more potent all in one supplement.. The All In One 5 HTP Supplement You've Been Looking For - Clean Nutra CalmAgain provides multiple full-dose products in one Mood Support Balance Support complex containing a full L-Theanine 200mg and GABA Supplement in a convenient 2 capsule dosage. Finally a bigger supplement than GABA 100mg, L-Theanine 100 mg, and 5 HTP 100 mg have been packed into one convenient solution.. Introducing the CalmAgain All In One Supplement - In addition to containing large milligram dosages of L-Theanine 200mg and many 5 HTP Supplements, our formula also contains a whopping 750mg of GABA Powder. This is a powerful alternative to GABA 500mg, L Theanine 100 mg, Ashwagandha 1000mg, and less potent Ashwagandha Capsules. Not your average L-Theanine Supplements, Ashwagandha Pills, and 5-HTP Powder.. A Powerful 5-HTP Supplement with Theanine 200mg Capsules - CalmAgain is overflowing with potent htp 5 powder, tryptophan 500mg capsules, l-theanine 200mg, SAMe, L-Glycine, Vitamin D3, Vitamin B6, Magnesium Glycinate, and L Tyrosine. Clear out the countless l theanine drops, 5 htp gummies, tryptophan drops, and aswagandha gummies that are lesser and choose just one inclusive supplement from Clean Nutraceuticals.. Vetted and Trusted Ingredients - We pride ourselves in offering a quality supplement that combines the benefits of L- Theanine, ashwagandha extra strength, 5 htp high potency, L Glycine, and Black Pepper Extract. Our formulas are proudly made in a registered and certified facility. Many products offer only a few ingredients like l-theanine 200mg, l theanine 500mg, and l-theanine 400mg. Enjoy an all-in-one Clean Nutra supplement..

Quality of Life Pure Balance Serotonin PremiumHelps Boost Serotonin & Cortisol Levels - includes 5-HTP, Venetron, Sensoril, Vitamin D3 & L-Theanine60 Capsules

SUPPORTS MOOD Our PureBalance Serotonin supplement is made with natural mood enhancing herbs to help reduce stress, support weight management, promote relaxation, and support a positive mood, and help you get more restful sleep.. BALANCES SEROTONIN AND CORTISOL LEVELS PureBalance Serotonin provides the raw material your body needs to make serotonin to bring you one step closer to a healthier you.. FROM NATURALLY SOURCED INGREDIENTS Our formula is made with a proprietary blend of 5-HTP, Venetron and Sensoril helps to boost the effects of our natural stress support.. MADE IN THE UNITED STATES All Quality of Life supplements are manufactured in the USA with globally sourced ingredients in an FDA registered and NSF certified facility that adheres to Good Manufacturing Practices GMP to ensure the highest quality of production. Our vegetarian formulated capsules are vegan, gluten free, dairy free, and preservative free..

Micro Ingredients 5-HTP 200mg with Chamomile Flower Extract, 180 Capsules, 2 in 1 Formula, 98% Griffonia Seed Extract, Enhanced with Chamomile | Highly Bioavailable for Mood, Sleep & Relaxation

Micro Ingredients 2-in-1 5htp plus pure chamomile flower. A natural plant-derived formula that combines authentic African sourced 5htp from griffonia simplicifolia with traditional chamomile flower. Working together to create natural sleep support plus ultimate relaxation and mood balance.. Every 2 capsule serving size offers premium herbal extracts that allow for this 5htp to be held at a 98 pure griffonia seed extract. Providing 5htp 200mg combined with a 200mg chamomile extract that leaves for 90 potent servings per pouch.. 5-HTP, also known as 5-hydroxytryptophan, is considered a natural occurring amino acid that cant be made within the body. This means we must obtain it through either diet or supplements. Chamomile on the other hand, is a natural flowering plant that is commonly used in chamomile tea.. When these natural herbs get paired together, this creates unique benefits that offer dual-action support to manage cravings, while promoting an overall daily positive mood and restful sleep. The ultimate pick-me-up formula to get you through the hardest days.. Premium non-GMO ingredients. Made without soy, dairy, gluten, and tree nuts. It also must pass our 3rd part lab tests to ensure a product that is safe, pure, and potent..

Designs for Health 5-HTP 50mg with Vitamin B6 (P-5-P) - 5-HTP Synergy 50 mg Supplement - Serotonin Precursors to Help Support Healthy Mood + Appetite (90 Capsules)

The Feel Good Hormone - 5-Hydroxytryptophan, made from the amino acid L-tryptophan with the help of vitamin B6, is a precursor to serotonin production. The amino acid tryptophan can be found naturally in protein foods such as turkey and milk. Serotonin is a vital neurotransmitter known as the feel-good hormone. . Serotonin Precursor - 5-HTP Synergy is a synergistic formula of 5-hydroxytryptophan 50 mg and vitamin B6 10 mg for supporting overall neurotransmitter metabolism by providing precursors of serotonin. . Well Absorbed - 5-HTP is well absorbed from an oral dose, with about 70 ending up in the bloodstream. Absorption of 5-HTP is not affected by the presence of other amino acids therefore, it may be taken with meals without reducing its effectiveness. . Higher Standards. Better Results - Designs for Health maintains a strict, no-compromises approach to quality raw material selection. We never cut corners with substandard ingredients. This product is Non-GMO, Gluten-Free, and Vegetarian-friendly.. Clinically-Trusted Care - DFH is the 1 practitioner supplement brand recommended by functional medicine professionals and the 1 practitioner supplement brand personally trusted by functional medicine professionals..

Klaire Labs 5-HTP 50 mg - Hypoallergenic 5-HTP from Griffonia Seed Extract (5-HTP) - Hydroxytryptophan Serotonin Support Supplement to Promote Mood (100 Capsules)

50mg of 5-HTP for serotonin support, extracted from griffonia seeds.. Because neurotransmitters are synthesized from dietary amino acids, supplementation with both neurotransmitters and their amino acid precursors, can have a positive effect on mood and overall mental well-being.. L-5-hydroxytryptophan may provide a safe alternative to L-tryptophan which is used to form serotonin, a brain neurohormone involved in appetite control, and mood regulation.. Hypoallergenic product free of the following common allergens milkcasein, eggs, fish, shellfish, tree nuts, peanuts, wheat, gluten, soybeans, corn, and yeast. Contains no artificial colors, flavors, or preservatives.. Trusted by healthcare practitioners since 1969, Klaire Labs products are developed closely with physicians and are intended to be used as directed by a healthcare practitioner..

Designs for Health 5-HTP 100mg with Vitamin B6 (P-5-P) - 5-HTP Supreme 100 mg Supplement - Serotonin Precursors to Help Support Healthy Mood + Appetite (60 Capsules)

The Feel Good Hormone - 5-Hydroxytryptophan, made from the amino acid L-tryptophan with the help of vitamin B6, is a precursor to serotonin production. The amino acid tryptophan can be found naturally in protein foods such as turkey and milk. Serotonin is a vital neurotransmitter known as the feel-good hormone. . Serotonin Precursor - 5-HTP Supreme is a synergistic formula of 5-hydroxytryptophan 100 mg and vitamin B6 20 mg for supporting overall neurotransmitter metabolism by providing precursors of serotonin. . Well Absorbed - 5-HTP is well absorbed from an oral dose, with about 70 ending up in the bloodstream. Absorption of 5-HTP is not affected by the presence of other amino acids therefore, it may be taken with meals without reducing its effectiveness. . Always Pure Effective Products - This product is Non-GMO, Vegetarian-Friendly, and contains No Gluten, Dairy, or Soy.. Clinically-Trusted Care - DFH is the 1 practitioner supplement brand recommended by functional medicine professionals and the 1 practitioner supplement brand personally trusted by functional medicine professionals..

Nutricost 5-HTP Powder 25 Grams (300mg Per Serving) - Gluten Free & Non-GMO, Pure 5-htp

25 Grams of 5-HTP Powder Per Bottle. High Quality 5-HTP Powder 3rd Party Tested. 300mg Per Serving 83 Servings Per Bottle. Serving Size 1 Scoop Included. Made in a GMP Compliant, FDA Registered Facility.

Pure 5-HTP (5-Hydroxytryptophan) Plus GABA Supplement - for Sleep, Mood & Stress Management - 60 Veggie Caps

SLEEP - These synergistic nutrients work at controlling your natural circadian rhythm, supporting sleep duration quality - a more restful sleep, without the side effects of waking up groggy - so you can wake up ready to take on the world. CREATE AN INNER CALM - Reduce Stress. With key brain compound amino-acids, Pure 5-HTP has been designed to support a deep sense of relaxation without sacrificing alertness or mental sharpness. Used to suppress feelings of stress nervousness and encourage those brain waves responsible for tranquillity concentration. So you can remain cool, calm collected.. A HEALTHY MIND, ATTITUDE MOOD - Gamma Amino Butyric Acid GABA is a key inhibitory neurotransmitter encouraging positive thoughts, mental clarity focus. Coupled with the feel good neurotransmitter 5-HTP that regulates promotes positive moods, Pure 5-HTP is the perfect supplement to maintain a positive outlook.. PURE NATURAL - Pure 5-HTP is the natural alternative. It contains no Magnesium Stearate, GMOs, gluten, dairy, soy, preservatives, artificial colors or flavors. Made with Kosher Halal ingredients. So you can reap the benefits without any of the Nasties. TRUSTED - 1 Practitioner Grade, USA Made, 3rd Party Tested. 100 Satisfaction Guarantee or your money back, order with confidence, risk free..

Pure Encapsulations 5-HTP 100 mg | 5-Hydroxytryptophan Supplement for Brain, Sleep, Eating Behavior, and Serotonin Support* | 60 Capsules

Promotes Well Being 5-HTP encourages the synthesis of serotonin, an important neurotransmitter involved in the regulation of endocrine and brain activity responsible for well-being and appetite.. Sleep Support Serotonin is an important neurotransmitter that is involved in regulating sleepwake cycles. Appetite Support 5-HTP has been shown to help moderate appetite and food cravings.. Pure Quality Our supplements are made with only premium ingredients sourced from trusted suppliers and guided by our nutritional experts, then carefully manufactured and tested to verify their potency and purity.. Pure Difference What makes us different isn't just our process or what goes into our supplements -- what we leave out matters, too. Pure Encapsulations products are FREE FROM wheat, eggs, tree nuts peanuts, gluten, artificial colors, flavors sweeteners, coatings and shellacs, GMOs, and unnecessary binders, fillers preservatives..

Pure Encapsulations 5-HTP 50 mg | 5-Hydroxytryptophan Supplement for Brain, Sleep, Eating Behavior, and Serotonin Support* | 60 Capsules

Promotes Well Being 5-HTP encourages the synthesis of serotonin, an important neurotransmitter involved in the regulation of endocrine and brain activity responsible for well-being and appetite.. Sleep Support Serotonin is an important neurotransmitter that is involved in regulating sleepwake cycles. Appetite Support 5-HTP has been shown to help moderate appetite and food cravings.. Pure Quality Our supplements are made with only premium ingredients sourced from trusted suppliers and guided by our nutritional experts, then carefully manufactured and tested to verify their potency and purity.. Pure Difference What makes us different isn't just our process or what goes into our supplements -- what we leave out matters, too. Pure Encapsulations products are FREE FROM wheat, eggs, tree nuts peanuts, gluten, artificial colors, flavors sweeteners, coatings and shellacs, GMOs, and unnecessary binders, fillers preservatives..

Pure Encapsulations 5-HTP 100 mg | 5-Hydroxytryptophan Supplement for Brain, Sleep, Eating Behavior, and Serotonin Support* | 180 Capsules

Promotes Well Being 5-HTP encourages the synthesis of serotonin, an important neurotransmitter involved in the regulation of endocrine and brain activity responsible for well-being and appetite.. Sleep Support Serotonin is an important neurotransmitter that is involved in regulating sleepwake cycles. Appetite Support 5-HTP has been shown to help moderate appetite and food cravings.. Pure Quality Our supplements are made with only premium ingredients sourced from trusted suppliers and guided by our nutritional experts, then carefully manufactured and tested to verify their potency and purity.. Pure Difference What makes us different isn't just our process or what goes into our supplements -- what we leave out matters, too. Pure Encapsulations products are FREE FROM wheat, eggs, tree nuts peanuts, gluten, artificial colors, flavors sweeteners, coatings and shellacs, GMOs, and unnecessary binders, fillers preservatives..

5HTP 400mg Capsules | 120 Capsules | 5-HTP Extra Strength Supplement | Non-GMO, Gluten Free | 5 Hydroxytryptophan | by Horbaach

Our 5HTP supplement features 400mg per serving, for maximum support. Premium HTP 5 source, expertly extracted from the seeds of an exclusive, West African tree shrub. How to get 5-HTP You can't get the benefits of HTP-5 from any foods. Promotes natural Serotonin levels. Our Non-GMO and Gluten Free Formula is free of any artificial colors or flavorings.

5-HTP 200mg | 120 Vegan Capsules | 5 HTP Supplement to Support Stress Relief, Brain Health, Enhanced Mood, Sleep & Serotonin | Pure 5HTP 100mg Pills Plus Co-Factors Vitamin B6 & Vitamin C

Calm Mind Enhanced Mood - 5-HTP can help you feel positive, relaxed and refreshed. Take the next step towards positivity 5HTP, the scientifically proven serotonin supplement.. Relieve Stress Improve Sleep - A lack of serotonin can stress you out and hurt sleep quality circadian rhythm. By taking 5HTP, you can increase levels of serotonin, which can lead to improved mood, better sleep, and less stress.. 5 HTP Plus Vitamin B6 C - These vitamins are crucial co-factors in helping the body produce, convert and utilize 5-HTP properly. Choose a premium 5-HTP formula that includes everything you need to get the most from this incredible nutrient.. Premium Plant-Based Formula - Our 5 HTP 5-hydroxy tryptophan is naturally sourced from griffonia seeds. Each capsule contains 100 mg so that you can divide a 200 mg dose throughout the day if desired.. Highest Quality Formula Manufacturing - Plant-Sourced 5 HTP Made in USA Lab Tested Verified Vegan Non-GMO Gluten-Free Allergen-Free Soy-Free Nut-Free Dairy-Free Zero Animal Products No Artificial Colors or Flavors.

Superior Labs 5-HTP Worx - 150 mg Pure 5-HTP Plus Potent Serotonin Blend - 90 Vegetable Capsules - Serotonin Amplification - Neurotransmitter Support - Brain Health - Mood Support

SEROTONIN AMPLIFICATION - 5-HTP WORx is an amino acid that your body produces naturally. Your body uses 5-HTP to make serotonin. Low serotonin levels are associated with many mental ailments and health problems.. ABSOLUTE PURITY - ZERO SYNTHETIC ADDITIVES, FILLERS, HEAVY METALS, ADULTERANTS - You will never see unnecessary additives such as stearates, dioxides, glycerides or fillers other brands use to make manufacturing cheaper, faster and easier. In addition, we put all ingredients and products through rigorous testing to make sure they are 100 free of contaminants.. UNQUESTIONABLE QUALITY - ALL PRODUCTS PRODUCED IN 3rd PARTY CERTIFIED NSF CERTIFIED FACILITIES - Few are and can pass the stringent standards of NSF. Our products are produced in facilities that have been 3rd party audited and certified for quality by NSF, one of the most stringent quality manufacturing assurance organizations in the industry.. ZERO UNNATURAL INGREDIENTS Our product contains NO unnatural ingredients such as magnesium stearate, silicon dioxide, titanium dioxide and other potentially harmful unnatural ingredients that are commonly found in other brands.. NO RISK AND NO HASSLE - For almost a decade, we have been delighting Amazon customers. If you are not satisfied with the benefits, results, or are unsatisfied with the product in any other way, please contact us and we'll gladly refund your money in 48 hours or less. That's it - no questions, no hassle, no risk. .

NOW Supplements, 5-HTP (5-hydroxytryptophan) 200 mg, Double Strength, Neurotransmitter Support*, 120 Veg Capsules

NEUROTRANSMITTER SUPPORT NOW Double Strength 5-HTP has twice the 5-HTP 200 mg per capsule as in our regular strength product 100 mg per capsule.. SUPPORTS POSITIVE MOODWITH GLYCINE, TAURINE AND INOSITOL 5-HTP, the intermediate metabolite between the amino acid tryptophan and serotonin, is extracted from the seed of an African plant Griffonia simplicifolia.. CLASSIFICATIONSCERTIFICATIONS Non-GMO, Kosher, Dairy Free, Egg Free, Made without Gluten, Nut Free, Soy Free, VeganVegetarian. GMP Quality Assured NPA A-rated GMP certification means that every aspect of the NOW manufacturing process has been examined, including our laboratorytesting methods for stability, potency, and product formulation.. Packaged in the USA by a family owned and operated company since 1968. During the summer months products may arrive warm but Amazon stores and ships products in accordance with manufacturers' recommendations, when provided..

NOW Supplements, 5-HTP (5-hydroxytryptophan) 100 mg, Neurotransmitter Support*, 120 Veg Capsules

VEGAN CAPSULESNEUROTRANSMITTER SUPPORT 5-HTP is the intermediate metabolite between the amino acid L-tryptophan and serotonin.. SUPPORTS POSITIVE MOOD AND RELAXATION 5-HTP supports the production of serotonin in the brain and central nervous system serotonin can impact sleep, mood, appetite, and body temperature.. CERTIFICATIONSCLASSIFICATIONS Dairy Free, Egg Free, Kosher, Made without Gluten, Non-GMO, Nut Free, Soy Free, VeganVegetarian. GMP Quality Assured NPA A-rated GMP certification means that every aspect of the NOW manufacturing process has been examined, including our laboratorytesting methods for stability, potency, and product formulation.. Packaged in the USA by a family owned and operated company since 1968. During the summer months products may arrive warm but Amazon stores and ships products in accordance with manufacturers' recommendations, when provided..