5-HTP 100mg (Previously named Happy Days)

100mg 5-HTP with zinc and B vitamins

95 ratings. Latest review shown below 3.92

"Years ago I was prescribed L-tryptophan by my doctor for low mood. Without warning Merck stopped manufacturing it and then later doctors were told they were not permitted to prescribe it. 5-HTP from Healthspan was a life saver for me!"

60 Tablets

5-HTP 100mg (Previously named Happy Days)

60 Tablets

Key Benefits

  • A natural way to increase your levels of 5-htp
  • Contains vitamin B3, B6 and zinc to support normal psychological and neurological functions
  • Also includes vitamin C, zinc, folic acid and biotin

Product overview

  • Suitable for Vegetarians
  • Suitable for Vegans
  • Gelatin Free

Healthspan’s 5-HTP 100mg is a natural way of increasing your body’s levels of 5-HTP. Each tablet provides 100mg of 5-HTP along with other important nutrients including vitamin B3, vitamin B6, vitamin C, zinc, folic acid and biotin.

5-Hydroxytryptophan, more commonly known as 5-HTP, is derived from the amino acid l-tryptophan. In the body 5-HTP is converted into the brain chemical messenger serotonin. 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.

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.

Read more

Nutritional Information


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

Key nutritional values

Typical vales, % RDA (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)


Maltodextrin, Vitamin C, L-5 Hydroxy Tryptophan (5-HTP - Griffonia Seed Extract), Cellulose, Vitamin B3, Coating (Hypromellose, Glycerin - of vegetable origin, Iron Oxide), Zinc Citrate, Vitamin B6, Stearic Acid - of vegetable origin, Silica, Magnesium Stearate - of vegetable origin, Folic Acid, D-Biotin.

Perfect Partners to 5-HTP

These products work in perfect synergy alongside 5-HTP

Reviews for Happy Days® 5-HTP Tablets

We use the independent Feefo service to collect our reviews- so you can be sure that they are verified and unedited Find out more

If you see a review listed 'As Above' this occurs when a customer has reviewed more than one product at the same time. We are currently looking into resolving this - we apologise for any inconvenience.

Overall Rating: 4.08 / 5 stars, based on 12 reviews

22 July 2014

Years ago I was prescribed L-tryptophan by my doctor for low mood. Without warning Merck stopped manufacturing it and then later doctors were told they were not permitted to prescribe it. 5-HTP from Healthspan was a life saver for me!

22 July 2014

It helps me to sleep better when i take it at bedtime. It helps with anxiety.

22 July 2014

Both my wife and I use this product, and it has helped us through a very rough year.

22 July 2014

difficult to prove but feel it helps my mood

21 July 2014

Believe the hype, take as suggested, seems to be effective: will do for me,

21 July 2014

I feel more alert and think more clearly, a bonus for an 80 year old....

21 July 2014

An easy to use website.

21 July 2014

The company, products, and quality are excellent. I have no further need for anything, as my Husband is now on care.
Thank you for past service.

21 July 2014

This helps my husband sleep when stressed

21 July 2014

It did not seem to help me much

Thank you for your review - A member of our Product Information Department will be in contact with you shortly.

Samantha, Healthspan Customer Care

29 May 2014

I would not be able to cope with the sudden death of my son if my friend had not advised me to try 5HTP.The medical profession could only offer me anti depressants which I did not want to take mainly because of the side effects.5HTP help me stand up and find some joy in life.

28 May 2014

Great to use when starting to feel overwhelmed plus helps sleep too.

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.