We read the published research one ingredient at a time.
Jujube seed
500mg
For a mind that won't settle
The seed of the sour jujube, used in Chinese medicine for over two thousand years. We use a standardised extract, so every sachet carries the same measured amount rather than whatever a batch of raw powder happens to contain.
Mahmoudi 2020 · 106 women
Glycine
3,000mg
For calmer evenings
An amino acid your body already makes. Taken before bed it works overnight rather than in the glass. The trials that found an effect used 3g. Most supplements that list glycine use 500mg, a sixth of that.
Nutrients 2024 · 4 trials at 3g
Magnesium
250mg
For tiredness and fatigue
Magnesium bound to an amino acid, which the body absorbs better than the magnesium oxide used in cheaper supplements. An adult woman needs around 270mg a day. One sachet gives 250mg. Most supplements give 150mg.
Nat. Sci. Sleep 2025 · 155 adults
L-theanine
400mg
For taking the edge off
An amino acid found in green tea. It takes the edge off without sedating. Trials have used 200 to 400mg. We use 400.
Mol. Psychiatry 2026 · 31 trials
Hyaluronic acid
120mg
For skin hydration
The molecule skin uses to hold water, and your body makes less of it as you get older. We use sodium hyaluronate at 120mg, the same form and the same amount as the trial.
Scientific Reports 2025 · 150 adults
Vitamin C
80mg
For collagen, and your skin
Your body cannot build collagen without it. That is chemistry rather than a claim: without vitamin C the collagen your skin makes does not hold together. 80mg is a full day's intake for an adult. We use sodium ascorbate, a non-acidic form that is gentler in a nightly drink.
Nutrients 2017 · vitamin C and skin
What we left out
Ashwagandha
The one everyone expects. It can affect thyroid hormone levels, and thyroid conditions are more common in women, and more common again with age.
Melatonin
A prescription medicine in the UK rather than a supplement, so it was never an option for a nightly drink. It also does a narrower job than most people expect: it shifts the timing of your body clock rather than making you sleepy.
Valerian
You'll find it in plenty of night-time teas, which blend and sweeten around its smell. The evidence is the problem. People report sleeping better on it, but the effect shrinks in the better-designed trials and doesn't show up when sleep is measured rather than self-reported.
Ten ingredients in total. The other four are natural flavouring, citric and malic acid for the sharpness, stevia, and an anti-caking agent.
Nutrition label
Per sachet
Energy
84kJ / 20kcal
of which sugars
0g
Active ingredients
Active ingredients
Per sachet
%NRV
Magnesium
as bisglycinate
250mg
67%
Glycine
3,000mg
†
L-theanine
400mg
†
Jujube seed extract
500mg
†
Vitamin C
as sodium ascorbate
80mg
100%
Hyaluronic acid
as sodium hyaluronate
120mg
†
NRV: Nutrient Reference Value. † No NRV established.
How to take it
Tear one sachet into a glass, add cold water or tonic and ice, or warm water if you'd rather, and stir until it dissolves.
7 things nobody told you about wine, sugar and sleep
Fifteen minutes, from Adam. Free with every plan and yours to keep, even if you cancel.
What's in it
0:00Why the glass that was fine at thirty-five costs you the next morning now.
2:40Waking at three or four, and why most people never connect it to the wine.
5:15What sugar in an evening drink actually does, and the labels worth reading.
8:30Magnesium: the dose on most tablets, and what it should be.
11:50The five things that make more difference than giving it up.
You are one of the firstThe kit grows as we make it. A printed booklet and a card with your name on it are being made now, and anything we add lands in a box of yours at no extra cost.
Kinn & Mint
Fresh mint, soda, ice.
You'll need
One sachet of Kinn
A splash of cold water
A small bunch of fresh mint
Soda water
Ice cubes
Serve it in a tall glass or a highball.
How to make it
Four steps.
All made in the glass you drink from.
Step 1
Slap the mint
Clap the bunch between your palms once. Don’t crush it, crushed leaves go bitter.
Step 2
Dissolve the sachet
A splash of cold water in the glass, stir until it’s gone.