Compare L-theanine, 5-HTP and ashwagandha products on the amount of each ingredient per daily dose and the cost per day. None of these ingredients has an authorised health claim in the UK, so we describe what's in each product, not what it does, and if you're struggling with stress or low mood, speak to your GP.
All vitamins & supplements · Ashwagandha · Adaptogens · Sleep & relaxation · B vitamins · Magnesium
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What is L-theanine?
L-theanine is an amino acid found naturally in tea leaves, sold here as capsules, including a branded L-theanine ingredient called Suntheanine. It has no authorised health claim, so we don't say it reduces stress or affects mood.
Compare the milligrams of L-theanine per capsule and per daily dose, and the cost per day. Some products combine it with other ingredients, so check the full label.
What do supplements for stress actually contain?
Besides L-theanine, this collection holds 5-HTP (a compound the body makes from the amino acid tryptophan), ashwagandha root extract (capsules and gummies) and a relax-themed gummy blend. The only mood-related wording that is authorised belongs to certain vitamins and minerals, for example "Magnesium contributes to normal psychological function" and "Vitamin B12 contributes to normal psychological function", usable only where a product is at least a source of that nutrient (GB claims register).
Ashwagandha needs particular care: the US National Institutes of Health says ashwagandha should be avoided during pregnancy and while breastfeeding, and doesn't recommend it for people with thyroid or autoimmune disorders. Supplements can interact with medicines, including antidepressants: the NHS says some remedies and supplements may not mix well with sertraline, and its advice is to tell your doctor if you're taking any other medicines, herbal remedies, vitamins or supplements.
What does the NHS advise for stress?
The NHS advice starts with everyday steps, not supplements: be active, connect with people, take time for yourself and avoid relying on alcohol, smoking or caffeine.
The NHS says to see a GP if you're struggling to cope with stress or the things you're trying aren't helping, and adults can refer themselves to NHS talking therapies. If you need help urgently, call NHS 111; in an emergency, call 999. Speak to your GP or pharmacist before taking any product here if you take medication, have a medical condition, or are pregnant or breastfeeding.
We sell the products on this page. That's our commercial interest, and it's why we show the evidence alongside them. This page is general information for adults, not personalised medical advice. Food supplements should not replace a varied, balanced diet.
Written by Andy Arshad, SupplementHQ. Last reviewed 11 October 2026.