• L-Tryptophan
  • L-Tryptophan


£ 19.65

£0.33 / capsule
500mg | 60 capsules

An essential amino acid which is a precursor to serotonin and melatonin helping to promote peaceful sleep

L-Tryptophan - converts into serotonin and melatonin which is why many people find it an effective sleep aid

Tryptophan is an essential amino acid used to make protein. It is a precursor to serotonin and melatonin, helping to increase their production, which is why many people find it an effective sleep aid.

A serotonin imbalance is thought to be involved in the development of anxiety disorders and depression - by replenishing these levels, it may help alleviate these issues.

Tryptophan breaks down into serotonin, a calming neurotransmitter that may help stabilise mood. It is needed for the production of vitamin B3 (niacin), it helps boost growth hormone, and may help suppress appetite.

As with most amino acid supplements, your body needs vitamin B6 (pyridoxine) as a cofactor to ensure correct amino acid metabolism. To help rule out any possible deficiency of L-Tryptophan you may wish to take a vitamin B complex alongside L-Tryptophan


  • Most amino acids come in two forms; D- or L- (such as L-tyrosine or D-tyrosine). D-amino acid is a mirror image of the L- amino acid - in other words the D- form is a backward image
  • Both can be taken. However, the L- form is preferable as it is the exact image of the amino acid in its natural form found in the body. The L- form is considered the more effective for overall human health

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One (1) tablet at 4 pm and one (1) tablet before bed with a glass of water.


It’s important to take a little piece of sugar with L-tryptophan to help it pass through the blood-brain barrier (an apple or a piece of dark chocolate would also suffice)

Store in a cool, dry place, away from direct light.

Do not exceed the recommended daily dose.

Keep out of reach of young children.

Children, pregnant women, and women who are breastfeeding should consult their doctor before use.

Nutritional supplements should not replace a varied and balanced diet and a healthy lifestyle.

Check with simultaneous intake of medicines with your physician or healthcare professional. No long-term use without professional advice.


  • Tryptophan should not be taken if you are on SSRIs (Selective serotonin reuptake inhibitor) or MAOs (Monoamine oxidase inhibitors).

Per capsule

L-tryptophan 500mg.

Other Ingredients: Microcrystalline cellulose, Dicalcium phosphate, Stabiliser (Polyvinylpyrrolidone), Magnesium stearate, silicon dioxide

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