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5-HTP Capsule - 100mg

High grade 99% pure 5-HTP, an alternative to St John's Wort

In Stock
(199 reviews)
  • Naturally sourced - 99% pure
  • Top selling dietary supplement
  • Well researched nutrient
  • Good alternative to St John's Wort
90 Capsules
13.3p / Capsule
In stock
180 Capsules
10.0p / Capsule
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270 Capsules
9.2p / Capsule
In stock

The body converts 5-HTP into the neurotransmitter serotonin. Serotonin in the brain acts as a chemical messenger.

High strength vegetarian supplement

5-HTP (5-hydroxytryptophan) is derived from Griffonia Seed, using a specially developed process that retains as much of the active ingredient as possible. The supplement is then encapsulated in a fully vegetarian cellulose capsule, each providing 100mg of 5-HTP (in amino acid form).

99% pure UK sourced material

Unlike cheaper Griffonia Seed powder,our UK-sourced material is 99% pure. This means that it only requires 101mg of Griffonia Seed to make our 5-HTP capsules. Some of the cheaper supplements on the market use inferior 70% 5-HTP material, which is much less pure than ours, so please be aware of what you are buying.

You can also be assured that Just Vitamins 5-HTP is certified to be 'Peak-X' free, and is sourced and manufactured in the UK to GMP quality standards.

Improved capsule form

As a result of customer feedback we have recently made some improvements to this 5-HTP 100mg supplement. It appeared that the tablet-coating could crack and crumble under certain storage conditions, due to moisture absorption, so have changed the format of this supplement from a tablet to a two-piece capsule which has resolved the problem. Please be assured that the active nutrients are exactly the same as before, so if you are a regular customer you will still be buying the same, great 5-HTP supplement, just in capsule form, rather than as a tablet.

Nutritional Information

Each 5HTP 100mg capsule provides:
L-5-Hydroxy-Tryptophan (5HTP) 100mg
  from 101mg of Griffonia Seed Powder

Allergen Advice

This 5-HTP 100mg product is free from:
Gluten, Nuts, Yeast, Salt, Sugar, Artificial Colours Flavours and Preservatives.


Dosage / Suggested Intake

For restful sleep, swallow one to three 5-HTP 100mg capsules per day, 45 minutes before bedtime.

Take for 3 months then stop for a month, review, and re-start if required.

Capsule Size

19mm x 6.6mm capsule

Legal Category

Food Supplement

List of Ingredients

Calcium Carbonate prep (with Maltodextrin), Griffonia Seed 99% 5HTP, Microcrystalline Cellulose, Hydroxypropylmethyl Cellulose, Magnesium Stearate, Silicon Dioxide.

Cautions / Possible Side Effects

This 5HTP 100mg product may cause drowsiness.

Do not use 5-HTP if under medical supervision without consulting your medical practitioner.

Pregnant or lactating women should not take 5-HTP without consulting their doctor.

Do not use 5-HTP with antidepressants or other serotonin-modifying agents.

Customer Reviews

97% of customers like and recommend 5-HTP from 199 reviews (showing latest 50 reviews)
Review Date
Review Details
Service Rating : Good value, quick delivery.
Product : They work
Service Rating : waiting for black cohosh to arrive on site so I can order
Product : this item does what it says it will
Service Rating : Super fast delivery
Product : Having been on anti depressants and really not getting on with the side effects I decided to give these ago as an alternative method. I really think they work. I haven't felt low in a long time and they are good value for the quantity. Glad I did the research now!
Service Rating : great product, arrived quickly
Product : does what it says on the tin
Service Rating : quick
Product : Good quality
Service Rating : The service was excellent, the home page easy to understand, as for payment. The only wish I have is for a way to track my order in order to know when it will be delivered. Other than that - two thumbs up!
Product : I love them I love them I love them I love them!!!!!
Excellent prices, very quick service. What more could you ask for!
Service Rating : Fast expedition and good price.
Product : Excellent quality.
Service Rating : very good service and you do not have to wait for my product to come first class
Product : i use to use simply supplements but they got to expensive but yours is a better product and also it is in capsule form
Service Rating : Great service.
Product : Great service, very happy.
Service Rating : Fast delivery
Product : They do the job I think.
Service Rating : Delivered on time. product as described.
Product : Appears to be reducing my depression.
Service Rating : Very good customer service after my address was incorrect! Thank you.
Product : Brilliant!
Service Rating : Quick dispatch.
Product : They only seem to have any real beneficial effect for about 3 or 4 weeks, maybe I need to take a break from them after a month's use.
Service Rating : Fast delivery and good quality of supplements.
Product : I am happy with this product
Service Rating : Easy, value for money and quick delivery.
Product : They work - and I expect the best quality.
Service Rating : Excellent service.
Product : I'm realy pleased with the price and quality. Will definately use them again.
Service Rating : Fast shiping!. Exelent!
Product : Great
Service Rating : Delivery took three and a half weeks. Much too slow. Enquiries to Customer Services were met with prompt but abrupt replies which didn't adequately explain the delay and didn't offer an apology. Would not use you again.
Product : Very good for alleviating tension and low mood. Also good for improving sleep and also it seems for alleviating muscle stiffness. No obvious side effects.
Service Rating : Always great service
Product : Good value..find they help with stress, worth a try if you're down
Service Rating : happy with speed of service and product.
Product : happy with speed of service and product.
Service Rating : Very fast
Product : Bought to help sleep but not really worked.
Service Rating : asdasd
Product : asdasd
Service Rating : Low prices, and good products. Fast delivery at a low price.
Product : Keeps my anxiety at bay. I stopped use Benzo thanks to 5-HTP because I don't need it anymore. I can recommend this product.
Service Rating : Tutto perfetto, come sempre.
Product : Buon prodotto per riposare meglio la notte.
Very Happy with the service. Takes up to 10 days to get product, but always get what is ordered. Suppliments are also good
Service Rating : The website is incredibly user friendly, they have a vast array of supplements and I love the delivery system they have. Supplements through the letter box.
Product : I've been taking the maximum dosage for 2 weeks now, I've noticed nothing improve in my sleep or mood.
Service Rating : ....
Product : Mood swings
Service Rating : very happy with the vitamins and speedy delivery
Product : i suffer with depression and was on medication for years i no onger need the drs pills as these work perfectly well
Service Rating : Fast delivery, great communication love the packaging & great prices!
Product : One of very few companies to sell the high doses on looking for
Service Rating : Fantastic company excellent service
Product : I take them to help me have a natural sleep
Service Rating : excellent
Product : excellent
Service Rating : Quick service at the right price
Product : looks ok, not sure yet what benefits i expect or how soon ???? but certainly no ill effects.
Service Rating : Rapid response.
Product : I take one many/most days to help maintain serotonin levels in brain - heard this suggested by a consultant (neurologist, I think) on a Radio 4 health programme some years ago, to help prevent migraine-type headaches which returned to me in later life. Tried it and they seem to help.Tried coming off them and after a while the headaches returned, so think they do help.
Service Rating : first time i have used company but will do again.
Product : price is excellent value.
As usual
Service Rating : Arrived quickly in sealable packaging.
Product : Haven't helped my depression at all.
Service Rating : Very quick delivery, free postage - what's not to love?!
Product : I use them for low mood verging on (but not actually) depression. They work well and are better than anti-depressants when I don't actually need medication.
Service Rating : Tutto perfetto, servizio impeccabile e rapido.
Product : Eccellente prodotto, riposo bene e l'umore è migliorato. Ottimo anche l'effetto limitante nell'assunzione dei carboidrati. Ricomprerò
Service Rating : Good company, never let me down in several years.
Product : 5-HTP helps me sleep & feel brighter the next day.
Service Rating : Very good service. Prompt delivery. Well packaged. Very good value. The last time I bought 5HTP was from Holland and Barrett and they were twice the price.
Product : This is the 2nd time Ive used 5HTP for a bout of depression and I swear by it, within a week or two there is a marked difference.
Quick delivery even not in UK
great service excellent capsules
Service Rating : Very quick service
Product : Seem to be helping me sleep. Recommended by a friend.
Service Rating : good service
Product : early days but so far I'm impressed. sleeping better
Service Rating : Fast deliver, products as order. Quality seems very high. Will order from JustVitamins again
Product : .
Service Rating : Very fast shipping, very easy to order. Smooth transaction.
Product : Only started to use them but seems to be working.
Service Rating : good prices and prompt delivery
Product : to help with fibromyalgia
Service Rating : A very good company to deal with, tablets arrived within 3 days
Product : Have been taking 5HTP for some while now, sleeping better and feeling less stressed

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