Known in the East as Suan Zao Ren, the sour jujube seed — used for over 2,000 years and still listed in the Chinese Pharmacopoeia today. We use the standardised seed extract, not raw powder and not the fruit; the seed is the part with the heritage behind it. Standardised to a minimum 2% jujubosides so every sachet is the same.

Magnesium contributes to normal psychological function and to a reduction of tiredness and fatigue. We use the bisglycinate form — an amino-acid chelate that absorbs well and sits gently on the stomach, unlike the cheaper oxide and citrate forms.

An amino acid found in tea leaves. We use the pure L-form only — cheaper extracts are cut with the inactive D-form that does nothing. 400mg: a real dose, not a trace.

An amino acid, at the honest dose.. Where glycine appears at all, it's often at 500mg–1g — too little to matter. We use the full 3g. It also has a mild natural sweetness, which lets us keep added sweetener low.

Vitamin C contributes to normal collagen formation for the normal function of skin, to normal psychological function, and to a reduction of tiredness and fatigue. We use sodium ascorbate — a buffered, non-acidic form, gentler on the stomach than ascorbic acid in a drink taken every evening. 80mg is 100% of the UK reference intake.

The molecule your skin uses to hold water — naturally abundant in the dermis and declining with age. Tasteless and fully soluble, so it disappears into a warm drink. 120mg.