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Home › Amino acids & derivatives › L-Tryptophan

NOW FoodsAmino acids & derivatives

L-Tryptophan 500mg, 60 capsules

£12.99 for 60 capsules at Healf. That works out at 22p per 500 mg, which ranks it 2nd of the 2 L-Tryptophan products we price across 2 UK retailers.

What it really costs, per 500 mg22pOne 500 mg dose is our comparison unit for L-Tryptophan. It is not a recommendation.
A day22p
A week£1.52
A month£6.50
A year£79.02

At one 500 mg dose a day, this pack lasts 2 months. A month is 30 days, so twelve of them is not quite a year.

How we worked it out

  • Servings: 60 ÷ 2 per serving = 30
  • In the pack: 30 × 1 g = 30 g
  • £12.99 ÷ 30 g × 500 mg = 21.6p per 500 mg
  • A week 21.6p × 7 = £1.52 · a month × 30 = £6.50 · a year × 365 = £79.02
  • Amount per serving: stated on the label.

The standard dose is a comparison unit, not a recommendation. Always confirm the price on the retailer's site. How we compare everything.

Cheaper L-Tryptophan

Compare every product in this form →
TryptophanCheapest per 500 mgBulk · 220 mg a serving · 75p a month · a pack lasts 7 months2p£4.99View at Bulk (opens in a new tab)
This productHealf · 1 g a serving · £6.50 a month · a pack lasts 2 months22pshown above

Switching to the Bulk pack saves £5.75 a month at the same 500 mg dose.

Ranked purely by price per 500 mg. 29 combination products also contain L-Tryptophan.

On the label

L-Tryptophan · L-Tryptophan
1 g per serving (stated on the label)
Pack
60 capsules · 30 servings · 2 capsule(s) a serving
Cost per serving
43p (30 servings in the pack)
More label details
Sold by
Healf
What the listing says
“60 vcaps” · “Servings Per Container: 30” · “Serving Size: 2 Veg Capsules” · “L-Tryptophan (Free-Form) (1 g) ; 1000 mg”
Ingredients

L-Tryptophan (Free-Form) (1 g), Hypromellose (Cellulose Capsule), Rice Flour, Antioxidant (Ascorbyl Palmitate), Anti-Caking Agent (Stearic Acid (Vegetable Source))

From the Healf listing. Check the pack itself if you have an allergy: labels mark allergens in bold.

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One 500 mg dose is our comparison unit, not a recommendation.

Price history

1 price change since 1 October 2026. Checked on 20 days, most recently 20 October 2026.

Lowest recorded
£11.991 Oct
Highest recorded
£12.9917 Oct
First recorded
£11.991 Oct
Checked on
20 dayssince 1 Oct
Pack price at each check.
  1. Up at Healf: £11.99 → £12.99 (+8.3%)
  2. First checked at Healf: £11.99

Questions about this product

How much does NOW Foods L-Tryptophan 500mg cost per 500 mg?

22p per 500 mg, from £12.99 for 60 capsules at Healf, checked on 20 October 2026.

Is it the cheapest L-Tryptophan in the UK?

No, it is 2nd of 2. Tryptophan at Bulk works out at 2p per 500 mg.

How long does one pack last?

2 months at one 500 mg dose. The pack holds 30 g in total.

About NOW Foods

All 109 NOW Foods products, priced per dose

More from NOW Foods

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All L-TryptophanEvery form, cheapest per 500 mg firstL-Tryptophan guideWhat it is, why people take it, how the forms differNOW FoodsAll 109 products from this brand, per doseAmino acids & derivativesEverything else we price in this categoryL-Tryptophan price historyEvery L-Tryptophan product's price per dose and price historyBuild a basketThe cheapest way to buy several at onceHow we compareWhere every number on this page comes from