Prices and ratings below were checked on Amazon UK on 21 October 2026 and are refreshed regularly. Amazon prices change daily — the live price is always the one on Amazon. As an Amazon Associate we earn from qualifying purchases; it never changes the order of this table.
L-theanine, glycine, 5-HTP, rhodiola, zinc, taurine and B-complex compared on price per capsule.
Sleep & Nootropic Supplements UK — all 25 products
Prices checked on Amazon UK: 21 October 2026. Prices change daily — the live price is shown on Amazon.
#1
Igennus Super B-Complex High Absorption Methylated B Vitamins
180 Tablets
£22.09 £0.12 each price per unit
- INDEPENDENTLY VALIDATED RESULTS - in an independent 8-week consumer study, participants reported improvements…
- EXPERTLY DESIGNED FORMULA - precision formulated by nutrition scientists using bioactive and methylated B-vit…
- ENHANCED DELIVERY & ALL-DAY COVERAGE - sustained-release technology and twice daily dosing support gradual nu…
#2
Nutravita Vitamin B Complex High Strength
365 Tablets
£9.28 £0.03 each price per unit
- Nutravita's One Year Supply of Vitamin B Complex Micro Tablets - Our high strength Vitamin B Complex with add…
- High Purity & High Potency Vitamin B Complex With Vitamin D3 - Nutravita's Vitamin B Complex contains the per…
- Supports Your Body - Our Vitamin B Complex with added Vitamin D3 supports the maintenance of normal hair, ski…
#3
Solgar Zinc Citrate 30 mg Highly Absorbable Supplement
£18.47 £0.18 each price per unit
- SKIN, HAIR AND NAILS: Zinc contributes to the maintenance of normal skin, normal hair and normal nails, and t…
- EVERYDAY SUPPORT: Zinc contributes to the normal function of the immune system, to normal cognitive function …
- HIGHLY ABSORBABLE CITRATE FORM: Solgar Zinc Citrate provides zinc in a highly absorbable citrate form, compar…
#4
Bedtime Gummies
£19.99 £0.33 each price per unit
- DOZYBEARS – The Ultimate Bedtime Supplement – Enjoy 60 natural mixed fruit-flavored gummies designed to suppo…
- PREMIUM COMPLEX BLEND - Eleven vital botanicals, Amino & vitamins as B5, C, B2, B6, B12, B3 to further assist…
- BEST VALUE – Each bottle contains 60 gummies, providing a full 30-day supply for long-lasting health benefits…
#5
Solgar 5-HTP Complex Vegetable Capsules
£34.49 £0.38 each price per unit
- ✓ SUPPORTS RELAXATION & SLEEP: Formulated with 5-HTP from Griffonia seeds, valerian root extract, magnesium, …
- ✓ REDUCES TIREDNESS AND FATIGUE: Magnesium and vitamin B6 work together to reduce tiredness and fatigue, supp…
- ✓ SUPPORTS SEROTONIN PRODUCTION: 100 mg of 5-HTP per capsule aids in boosting serotonin levels, which is vita…
#6
Solgar Griffonia 5-HTP Complex
30 Capsules
£9.10 £0.30 each price per unit
- ✓ SUPPORTS RELAXATION & SLEEP: Formulated with 5-HTP from Griffonia seeds, valerian root extract, magnesium, …
- ✓ REDUCES TIREDNESS AND FATIGUE: Magnesium and vitamin B6 work together to reduce tiredness and fatigue, supp…
- ✓ SUPPORTS SEROTONIN PRODUCTION: 100 mg of 5-HTP per capsule aids in boosting serotonin levels, which is vita…
#7
New Leaf L-Theanine 400mg 120 Vegan Capsules
£9.49 £0.08 each price per unit
- INTRODUCTION TO NEW LEAF'S L-THEANINE CAPSULES - Our L-Theanine Capsules are specially formulated to support …
- ENHANCED WITH VITAMIN B6 - To further enhance the efficacy of L-Theanine, we have enriched these capsules wit…
- A COMMITMENT TO QUALITY - New Leaf is committed to maintaining the highest standards of quality & purity in t…
#8
Vitamaze 5HTP Griffonia Simplicifolia 667 mg,180 Vegan Capsules (6…
£23.97 £0.13 each price per unit
- HIGHLY DOSED: 180 vegan capsules with the extract of the Griffonia plant, 200 mg pure 5-HTP (5 hydroxy-trypto…
- VEGAN: The Vitamaze 5-HTP is made exclusively from non-animal ingredients and is therefore ideal for VEGETARI…
- BEST BIO-AVAILABILITY: Without the controversial additive magnesium stearate (magnesium salts of fatty acids)…
#9
L Theanine 400mg
£9.99 £0.08 each price per unit
- High-Strength L-Theanine 400mg – Premium Amino Acid Support: Each capsule delivers 400mg pure L-Theanine, pro…
- 120 Capsules = Full 4-Month Supply – Exceptional Value: Our pouch contains 120 L-Theanine capsules, providing…
- Vegan, Non-GMO & Clean-Label Ingredients: Formulated with Non-GMO ingredients and fully vegan-friendly capsul…
#10
5HXT Pro
£23.99 £0.20 each price per unit
- HIGH STRENGTH 5-HTP SUPPLEMENT – Each 2-capsule serving is extracted from a huge 4000mg of griffonia seed, de…
- NATURAL GRIFFONIA SEED EXTRACT PROVIDING 25% 5HTP – Our 5 htp supplement high strength formula is made using …
- SUPPORTS PSYCHOLOGICAL FUNCTION, IMMUNE HEALTH AND REDUCES TIREDNESS – 5-HXT Pro is high in vitamin B6 which …
#11
Kids L-Theanine Gummies
30 Gummies
£9.99 £0.33 each price per unit
- DELICIOUS KIDS L THEANINE GUMMIES: Our KIDS L-THEANINE GUMMIES are created to delight all your kids senses! O…
- ENRICHED WITH 50 MG OF L THEANINE, LEMON BALM AND VITAMIN B6: We are committed to offering you healthy and hi…
- WHY TAKE OUR KIDS L THEANINE GUMMIES?Sleep and relaxation helps our brain and body function properly, but a n…
#12
NOW Taurine 1000mg 100 Veg Capsules
100 g
£18.47 £184.70/kg price per unit
- Nervous system health
- Healthy visual function
- Non-gmo
#13
Lindens
60 Tablets
£7.49 £0.12 each price per unit
- HIGH POTENCY - Each Lindens 5-HTP tablet provides 50mg of Griffonia Simplicifolia seed extract, equivalent to…
- MENTAL PERFORMANCE - Our high-potency Lindens 5-HTP tablets are formulated to enhance mental performance and …
- CONVENIENT FORM - Take our rapid-release tablets in the evening with food for a convenient and effective way …
#14
Vitamatic L-Theanine 200mg with Caffeine 100mg 120 Vegetarian Tablets
£9.99 £0.08 each price per unit
- Boosts Energy & Mental Focus*
- Sports Nutrition Endurance & Energy
- Non-GMO & Gluten Free
#15
Nutrivo 5HTP Tablets
90 Tablets
£12.99
- 🌿 High-Strength 5 HTP Supplement – Each tablet contains 1000mg Griffonia Seed Extract, providing 100mg of pu…
- 📆 90 Tablets – 3 Months Supply – Enjoy great value with our once-a-day formula, delivering a full 3-month su…
- 😌 Natural Mood & Sleep Support – 5 HTP is a precursor to serotonin, supporting mood balance, relaxation, and…
#16
Cortisol Reducing Supplements for Women & Men
£9.98 £0.11 each price per unit
- 6-IN-1 CORTISOL SUPPLEMENT COMPLEX: CortiCalm+ brings together six carefully chosen botanicals in one high-st…
- PREMIUM BOTANICAL EXTRACTS: A carefully balanced adaptogenic complex featuring Ashwagandha, Rhodiola Rosea an…
- CALM, FOCUSED DAILY ROUTINE: One capsule a day, morning or evening, for women and men balancing work, trainin…
#17
Zinc Supplements 25mg
£9.99 £0.03 each price per unit
- Why Choose Nutrition Geeks Zinc Picolinate 3-in-1: Get a full 12-month supply of high-strength zinc supplemen…
- Balanced with Copper for Optimal Health: While zinc is essential, high zinc intake can deplete copper levels …
- Highly Absorbable & Easy on the Stomach: When taken with a meal our balanced formula ensures optimal absorpti…
#18
Vinco L-Theanine Supplement
£8.49 £0.07 each price per unit
- 𝐂𝐥𝐚𝐫𝐢𝐭𝐲 𝐚𝐧𝐝 𝐅𝐨𝐜𝐮𝐬: Experience the power of L-Theanine in its purest form. Our carefully formulated L-Theanine…
- 𝐐𝐮𝐚𝐥𝐢𝐭𝐲 𝐅𝐨𝐫𝐦𝐮𝐥𝐚: Our L-Theanine capsules are made in Britain’s GMP-certified facilities, ensuring standards o…
- 𝐒𝐮𝐩𝐞𝐫𝐢𝐨𝐫 𝐀𝐛𝐬𝐨𝐫𝐩𝐭𝐢𝐨𝐧: Each serving of our L-Theanine 400mg capsules is optimised for enhanced bioavailability,…
#19
Glycine
£27.21 £0.11 each price per unit
- Nervous System Support
- Promotes Restful Sleep
- Pharmaceutical Grade
#20
Magnesium for Relaxation & Sleep Support with L-Theanine & Herbal…
£8.49 £0.09 each price per unit
- FIND PEACEFUL NIGHTS AGAIN: Tired of restless nights and waking up feeling drained? Our natural blend of Magn…
- CALM YOUR MIND & BODY: If racing thoughts keep you up at night, this gentle formula encourages a calm state o…
- EASE STRESS & DAILY TENSION: Long days often bring heavy stress. Our carefully selected ingredients work toge…
#21
Vitammies Sleep Gummies for Adults
60 Count
£11.99 £0.20 each price per unit
- BOTANICAL SLEEP BLEND WITH 5HTP AND MAGNESIUM: Vitammies bedtime gummies combine 5HTP from Griffonia Seed Ext…
- PROMOTES CALM AND RESTFUL SLEEP: Take one or two Vitammies sleep gummies 30 to 60 minutes before bed and let …
- SUGAR FREE AND CLEAN LABEL FORMULA: These sleep gummies for adults contain zero sugar, zero artificial sweete…
#22
Vinco Triple Magnesium L-Threonate with L-Theanine & Apigenin
120 Capsules
£29.99 £0.25 each price per unit
- 𝗧𝗛𝗘 𝗧𝗥𝗨𝗘 "𝗛𝗨𝗕𝗘𝗥𝗠𝗔𝗡 𝗦𝗟𝗘𝗘𝗣 𝗖𝗢𝗖𝗞𝗧𝗔𝗜𝗟". The true original Magnesium Sleep Stack recommended by Dr. Andrew Huberma…
- 𝗧𝗥𝗜𝗣𝗟𝗘 𝗦𝗧𝗥𝗘𝗡𝗚𝗧𝗛 𝗠𝗔𝗚𝗡𝗘𝗦𝗜𝗨𝗠 𝗙𝗢𝗥 𝗦𝗟𝗘𝗘𝗣 & 𝗖𝗔𝗟𝗠. A comprehensive extra strength pure elemental magnesium for sleep…
- 𝗖𝗟𝗜𝗡𝗜𝗖𝗔𝗟𝗟𝗬 𝗦𝗧𝗨𝗗𝗜𝗘𝗗 𝗛𝗜𝗚𝗛𝗘𝗦𝗧 𝗔𝗕𝗦𝗢𝗥𝗣𝗧𝗜𝗢𝗡 𝗠𝗔𝗚𝗡𝗘𝗦𝗜𝗨𝗠. Magnesium L-Threonate is the only clinically studied magnesi…
#23
Rhodiola Rosea Capsules High Strength
£9.95 £0.17 each price per unit
- RHODIOLA ROSEA 600MG: Each pouch contains 60 Rhodiola Rosea Capsules, delivering 600mg of Rhodiola Rosea extr…
- ONE CAPSULE PER DAY: Our high-strength Rhodiola formula is designed for simplicity and consistency. Just one …
- THE HERBAL ROOT: Rhodiola Rosea (Rhodiola rosea) is a traditional botanical native to cold, mountainous regio…
#24
Pure Encapsulations Rhodiola Rosea 100mg
£26.30 £0.29 each price per unit
- Dosage: Provides 100mg of rhodiola extract in each vegetarian capsule. Rhodiola has been used traditionally f…
- Plant Extract: Rhodiola rosea extract contributes to menopausal health and nutritional support
- 45 - 90 Days of Supply: The recommended dosage of this rhodiola rosea supplement is 1-2 capsules daily, with …
#25
VITA PHARMA Alpha-Gpc 600mg 120 Capsules
120 Capsules
£17.99 £0.15 each price per unit
- Boosts Cognitive Performance – Provides a natural source of choline to promote acetylcholine production, esse…
- Enhances Memory & Focus – Clinically studied to support mental clarity, recall, and learning—ideal for studen…
- High-Potency 600mg Capsules – Each serving delivers a strong, convenient daily dose for consistent support.
How to use this table
Ratings are the real Amazon UK owner ratings at the time of checking and the price per unit column is the fairest way to compare value across tub sizes. Click any product to see the live price, current offers and the full reviews on Amazon.
Related reviews and guides
- Best Supplements for Sleep UK (2026): What Actually Works
- Best Nootropics UK (2026): Supplements for Focus, Memory & Brain Performance
- 5-HTP for Sleep UK (2026): Does It Actually Work? Honest Review
- Rhodiola Rosea UK (2026): The Adaptogen for Mental and Physical Performance
- Taurine Supplement: Benefits for Gym Performance & Recovery (2026)
Last checked: October 2026.