5-HTP 100mg (Previously named Happy Days)

With complementary B vitamins and zinc.

"They have been the answer to my low mood....saved me going back on anti- depressants."

1-2 month supply Only 27p per day
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What is 5-HTP 100mg?

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

5-Hydroxytryptophan, more commonly known as 5-HTP, 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 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 the vitamins B3, B6 and C, plus folic acid, biotin and zinc. These nutrients have been included for their numerous associated benefits, none more so than vitamin B3, B6 and biotin which support normal psychological functions and normal functioning of the nervous system.

The 5-HTP used in Healthspan 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).

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Key Features

  • A natural way to boost serotonin levels.
  • Inclusion of vitamins B3 and B6 to support normal psychological function.
  • Added biotin, folic acid and zinc.
  • One of our top selling products, receiving a 5-star review rating.

Recommended Intake

Initially, swallow one tablet daily with water, increasing to a maximum of three tablets daily if required. 
Use for up to three months, then stop for one month and review.

Tablet / Capsule Information

  • Width 20.2mm
  • Height 8.8mm
  • Shape Oval

Note: Colour of the tablet shown here may differ slightly. This has no effect on the quality of the product and is part of the natural manufacturing process. Tablet not shown at actual size.

Typical values per Tablet   % NRV
Griffonia Seed Extract
providing 5-HTP 100mg
Vitamin B3 30mg NE 188
Vitamin B6 2.8mg 200
Vitamin C 80mg 100
Biotin 50 µg 100
Folic Acid 100 µg 50
Zinc 5mg 50
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NRV:Nutrient Reference Value RE: Retinol Equivalent a-TE: Alpha Tocopherol Equivalent NE: Niacin Equivalent µg: Micrograms

Recommended Intake

Initially, swallow one tablet daily with water, increasing to a maximum of three tablets daily if required. 
Use for up to three months, then stop for one month and review.


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.

Additional Information

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.

Typical values per tablet   % RI

%RI = percentage of reference intake of an average adult

Independent Reviews for Happy Days 5-HTP Tablets

Overall Rating: 4.52 / 5 stars, based on 531 reviews Below you can find the latest 25 reviews. To access the full list please click here

27 March 2017

They have been the answer to my low mood....saved me going back on anti- depressants.

We are pleased to hear how well the product is working for you.


25 March 2017

good helpful and tablet works for me

22 March 2017

I bought these for my son who thinks they are excellent.

Thank you for your comment - It's great to hear our 5-HTP is working well for your son.


19 March 2017

5thp... love these ones. Helps me to keep my sanity in place.

Thank you for your review - It's great to hear that you are feeling the benefits of this product.

Sarah B

19 March 2017

Omdat ik voel dat er iets in mijn lichaam gebeurd!!

Thank you for your review.

Sarah B

16 March 2017

Experiencing low mood , thought it may be more beneficial than vitamin B complex , but not sure if it is yet .

We appreciate you taking the time to leave a review We do hope that you find this product of benefit for you - Nicola

12 March 2017


11 March 2017

love these tablets, ran out and noticed a difference in my mood felt down and wondered why. since ordering more I feel so much happier.

05 March 2017

They seem to be doing what they're supposed to. Great for stressful times

We are pleased that these tablets are benefiting you.

01 March 2017

Clear information given in the catologue to guide you in choosing the product and helpful staff on phone available to provide more detail if required

Healthspan pride themselves in providing the best customer service, so we are pleased to hear how happy you are with the service we offer, it's great to know that our staff training is reflected in the conversations you have with us.


26 February 2017

Ett humörhöjande preparat kan vara bra för alla människor att ta ibland

24 February 2017

Not sure they're working for me at the moment, might need to build up levels.

24 February 2017

Not sure if they helped yet as not been taking for long but will update

19 February 2017

Excellent product, will order again in the near future.

19 February 2017

Absolutely, the best products, from the most reliable Company!

18 February 2017

I find these tablets help to lift mood during the winter months

16 February 2017

Don't think I am on these long enough to form an opinion yet

Thank you for taking the time to leave a review -   We do hope that you find this product of benefit - Nicola

14 February 2017

J'utilise ce produit régulièrement et il me donne satisfaction.

Thank you for sharing your experience with us.


13 February 2017

Excellent, would buy from them again

Thank you for your feedback - We are delighted to hear that you like our new packaging.


13 February 2017

Good product. I'm definitley feeling the benefits

It's great that you have benefit from taking our 5-HTP.

12 February 2017

Need more time to see how effective these are.

11 February 2017

A bit early to see any improvement.

09 February 2017

this is a great product to take when youre feeling low in mood. i have tried other over the counter herbal remedies.but i read reviews on these,and these just take the edge off,

08 February 2017

Good price and effective items but let down by being posted in a clear wrapper.

08 February 2017

I have found this product to be very effective when needed.

Thank you for sharing your experience.