5-HTP 100mg (Previously named Happy Days)

100mg 5-HTP with zinc and B vitamins

Only 22p per day 1-2 month supply
60 Tablets
Now £12.95 was £14.95

5-HTP 100mg (Previously named Happy Days)

60 Tablets

Key Features

  • A natural way to boost serotonin levels and increase your levels of 5-htp
  • Contains vitamin B3, B6 and zinc to support normal psychological and neurological functions
  • One of our top selling products, receiving a 5 star review rating

Product Overview

  • Gluten Free
  • Suitable for Vegetarians
  • Suitable for Vegans
  • Gelatin Free
What is 5-HTP? 

5-Hydroxytryptophan, more commonly known as 5-HTP, is is derived from the amino acid L-tryptophan. 5-HTP is converted in the body into the brain chemical messenger serotonin. Serotonin is a neurotransmitter; it helps send messages from one part of the brain to another. Serotonin influences the majority of the cells in the brain, including sleep, appetite, mood and sexual desire. 

Why Healthspan's 5-HTP?

Healthspan's 5-HTP 100mg is one of our most popular supplements, receiving a 5 star review rating. Each tablet contains 100mg of pure, natural 5-Hydroxytryptophan along with other important nutrients including vitamin B3, vitamin B6, vitamin C, zinc, folic acid and biotin. These nutrients have been included for their numerous associated benefits, none more so than vitamin B3, B6 and zinc which support normal psychological and neurological functions.

Also the 5-HTP used in Healthspan’s 5-HTP 100mg is sourced exclusively from the seeds of the West African Griffonia simplicifolia tree, the only natural source available. 

Alternatively if you are looking for a natural sleep aid why not try our Night Time 5-HTP (previously named Sweet Dreams)

Read more

Product Information


Initially one tablet daily, increasing to a maximum of three daily if required. Use for three months, stop and review

Key nutritional values

Typical values, % NRV (where applicable) in brackets:

L-5-Hydroxytryptophan (5-HTP) 100mg
Vitamin B3 30mg (166)
Vitamin B6 2.8mg (200)
Vitamin C 80mg (100)
D-Biotin 50mcg (100)
Folic Acid 100mcg (50)
Zinc 5mg (50)


Bulking Agent: Maltodextrin, Griffonia Seed Extract (5-Hydroxytryptophan), Vitamin C Prep. (Ascorbic Acid, Hypromellose), Bulking Agent: Microcrystalline Cellulose, Nicotinamide, Coating (Hypromellose, Titanium Dioxide, Glycerin, Iron Oxides), Zinc Citrate, Stearic Acid, Anti-Caking Agent: Silicon Dioxide, Magnesium Stearate, Pyridoxine Hydrochloride, Folic Acid, Biotin.

Not suitable for pregnant or lactating women. May cause drowsiness; do not drive or operate machinery if affected. If you are taking any prescribed medication or have any medical conditions always consult your doctor or pharmacist before taking vitamins or supplements. Keep out of sight and reach of young children. Do not exceed stated recommended intake. Food supplements must not be used as a substitute for a varied and balanced diet and a healthy lifestyle. Store in a cool, dry place. If you experience an adverse reaction, stop taking the supplement and seek medical advice.

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Independent Reviews for Happy Days® 5-HTP Tablets

The views expressed below are the personal opinion of Healthspan customers. Healthspan does not endorse these views, nor should they be regarded as health claims or medical advice. All reviews are collected by a 3rd party called Feefo. Find out more

Overall Rating: 4.52 / 5 stars, based on 395 reviews Below you can find the latest 25 reviews. To access the full list please click here

27 July 2016

I feel a lot better for taking it.

25 July 2016

Too early to offer a comment/review, but no adverse side effects.

24 July 2016

Too early to tell if it works long term

19 July 2016

Very pleased, will be 're ordering

15 July 2016

I start taking these from about October. I need a bit of a lift during the darker winter months and these do the job.

14 July 2016

Helps me relax. Great product.

13 July 2016

Been feeling low in mood and extremely stressed from my job. Did not want to take prescribed medication from my GP.
Looked at the information on Healthspan and decided to order 5-HTP.
Have definitely seen an improvement in how I feel in quite a short time, am happier, less tired and enjoying being me again! Would highly recommend this product.

13 July 2016

Effective but it takes time to establish the ideal dosage.

08 July 2016

These have made a big difference to my 17 yr old son. He's much calmer and sleeps better now. Anxiety is more manageable now.

07 July 2016

I take this product for MS symptoms, i feel it has helped a lot with energy levels and fatigue.

It's wonderful to hear how well the product is working for you.

06 July 2016

Very effective and non addictive.

04 July 2016

Really working . Much less anxious

03 July 2016

These are great, they make me feel good. I have used these before and when I came off them my moods seemed to change.

28 June 2016

Really help my Asperger's Syndrome husband to stay on a more even emotional keel and view 'the glass half full' instead of 'the glass half empty.' I have to give him two a day without a break as the difference soon becomes difficult if he misses a couple of days

That's great we are pleased you receiving benefits from our 5-HTP product.

26 June 2016


25 June 2016

Been on these over 10 years off and on. Definitely make a difference with no side effects

It's great to hear that you feel the benefits of our 5-HTP. - Tiffany

25 June 2016

Had this product before, use for 3 months then stop as suggested. Feel the benefit straight away. Give it a try if you are feeling low.

Thank you for your review - It's great to hear that you have felt the benefits of this products.

Sarah B

23 June 2016

Helps lift my mood and keeps me balanced

It's great to hear our 5-HTP are helping to lift your mood.


21 June 2016

Made me feel dreadful , I will never take anything again it's that simple. The long list so called good and natural ingredients also cane with some not so natural ingredients. And with a list of side effects as long as your arm. They went in the bin thank you

Thank you for leaving your feedback - Many of our customers are able to use this product successfully on a daily basis to improve their mood so we are sorry to hear that you experienced a side effect from our 5-HTP.  We have arranged for our Customer Care Team to contact you shortly - Tiffany

20 June 2016

I bought this to help with my quality of sleep. I now take 3 every night and they really help me sleep and I wake up earlier, feeling refreshed! I don't feel like I've got out of the wrong side of bed every morning!
I am recovering from M.E. / CFS and I have found these to improve my quality of sleep and as a knock on effect, improve my overall health.

We are so pleased to hear that our 5-HTP is has helped with your sleep and that it is also benefitting your overall health.