Breathing timer for 4-7-8, box and slow breathing

Serune is not recommended during pregnancy or breastfeeding, and is not suitable for children. If you take any medication or are under medical supervision, speak to your doctor or pharmacist before taking any food supplement. To check a specific ingredient, email us, and we will answer directly.

No added melatonin and no added hormones. That was a deliberate decision, not an omission.

Very little. Cacao is in the formula for flavour, not as an active ingredient, in a small amount, so you get the rich, not-too-sweet taste without much of what comes with it. Cacao naturally contains theobromine and a trace of caffeine, and we do not add any on top of that. If you are sensitive to either, email us and we will send you the exact figures.

Somewhere cool and dry, out of direct sunlight. The best-before date is printed on every pack.

Pre-orders are dispatched from Monday 16 November 2026.

Once we are shipping, UK orders placed before 2pm on a working day are dispatched the same day, and after that the next working day. Standard delivery is Royal Mail Tracked 48 and usually arrives 2–3 working days after dispatch. It is free on orders of £35 and over, and always free on a subscription; below £35 it is £1.00.

At checkout you can upgrade to Priority (£1.97, Royal Mail Tracked 24, usually next working day) or DPD (£4.97, next working day with a one-hour delivery window and the option to redirect or leave safe).

Outside the UK, delivery is calculated at checkout and typically takes 5–10 working days in Europe and 7–14 working days elsewhere.

Because it is currently open only for pre-order as our first batch is still in the process of production. You are charged today (to lock in your pre-order pricing), we’ll dispatch from 16th November onwards, and you can cancel any time before it ships for a full refund.

Yes, at any time, in your account, in one click. No minimum term, no notice period, no phone call, no hidden charges. And if you have any further concerns, you can just reach out to us.

Tell us within 30 days of your first pack arriving, and we will refund it. You keep the remainder of the pack. You won’t need to send anything back or fill in long forms to justify.

On the science page: every active, the amount in a sachet, the form we use and why, the published studies each dose was set against, and every authorised claim in full. https://www.serune.co.uk/pages/science

Eight actives in every sachet: saffron (Safr'Inside™) 30 mg extract standardised to ≥3% crocins; glycine 3,000 mg; magnesium 150 mg elemental as fully reacted, chelated magnesium bisglycinate; L-theanine 200 mg from green tea extract; lemon balm 400 mg leaf extract standardised to 7% rosmarinic acid; chamomile 400 mg extract standardised to 3% total apigenins; vitamin B6 2.8 mg as P-5-P; and zinc 10 mg elemental as zinc citrate, in a real cacao base with a Montmorency tart cherry note and Madagascar vanilla. There is no melatonin, no ashwagandha and no proprietary blend: every dose is on the label.

Yes. Serune uses Safr'Inside™, the extract used in the two 2025 saffron sleep trials (Sleep Medicine: X, and the University of East Anglia), at the dose those trials used: 30 mg, which is the amount in one sachet. What the trials looked at, in the people they looked at, is on the science page.

150 mg of elemental magnesium per sachet, as fully reacted, chelated magnesium bisglycinate. Elemental is the figure that matters: 150 mg of magnesium comes from roughly 1,150 mg of bisglycinate. That is 40% of the UK Nutrient Reference Value, so Serune is high in magnesium, and it is under the 250 mg a day supplemental ceiling. Magnesium contributes to a reduction of tiredness and fatigue and to normal psychological function.

Yes. Serune's L-theanine is extracted from green tea leaf (Camellia sinensis), the form with a history of use as a food. L-theanine made by chemical synthesis or fermentation is treated as a novel food and is currently going through authorisation; Serune does not use it.

For each active we found the form the human studies used and the amount they used, and matched it where the sachet allows. Glycine is 3 g because that is the dose in every human sleep study of glycine; saffron is 30 mg because that is the dose in the Safr'Inside™ trials; L-theanine is 200 mg because that is the dose in most of the human research; chamomile is 400 mg because that is the dose in the four-week sleep-quality trial. Where a trial used more than we do, the science page says so.

UK law only lets a food supplement make health claims that have been authorised. Three of Serune's eight actives hold authorised claims: magnesium, vitamin B6 and zinc, including "magnesium contributes to a reduction of tiredness and fatigue", "vitamin B6 contributes to the reduction of tiredness and fatigue" and "zinc contributes to normal cognitive function". Saffron, glycine, L-theanine, lemon balm and chamomile carry no authorised claim; we include them at researched doses and print exactly how much of each is in every sachet. The full list of authorised wordings is on the science page.

Serune is made in the UK in a BRCGS AA-certified facility, the food safety standard the supermarkets audit against, at its highest grade. Every batch of material comes with a Certificate of Analysis, so the standardisation on the label is measured, not assumed. Serune contains none of the 14 declarable allergens and is gluten-free.

Because it makes the better drink and it is the ritual most people already keep. Serune makes no claim for milk, and hot water works too.