F+NCTION: CALM cacao drink with marine collagen, from £49.99

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F+NCTION is a young London brand, trading as FNCTION LTD since 2024, that sells one main product: CALM, a salted chocolate cacao drink powder made in the UK. It is designed to be mixed with about 250ml of hot or cold water as an evening drink, and it suits adults who already like a hot chocolate in the evening and are interested in a supplement-style version.

The label lists 10g of hydrolysed marine collagen per serving, along with ashwagandha root extract, magnesium bisglycinate, L-theanine, reishi, chamomile, passionflower and B vitamins. It contains fish-derived collagen, so read the full ingredient list if you have allergies, and check with a pharmacist if you take any medication or are pregnant.

The brand was started by a founder who previously ran a private practice in London, and the drink is sold direct from its own website rather than in shops. Each order comes as either a tub with a scoop or boxes of single-serve sachets, and the salted chocolate flavour is the only one listed at the moment.

What's worth a look

• CALM 15 Day Sachet Box: currently £49.99. Individual sachets, which makes it the lowest-cost way to try it.
• CALM 30 Day: currently £95 as a one-off purchase. A month's supply, also available on subscription.
• CALM 30 Day Sachet Box: currently £98. The same month's supply in single sachets, handy for travel.
• CALM Starter Pack: currently £129. A 30-day supply with a frother and a glass.
• F+NCTION Frother: currently £25 on its own.

Prices can change, so check the product page before you order.

Current offers

• Subscribe and save 35% on the 60-day plan, billed at £61.75 every four weeks for the tub, with a free welcome pack (frother and glass) on the first order.
• Subscribe and save 30% on a 30-day supply at £66.50 every four weeks, with a free frother on the first order.
• Product pages show free delivery on orders over £40. The shipping policy lists standard UK tracked delivery at £5.99, so confirm the charge at checkout.
• A 30-day money-back guarantee: ask within 30 days of receiving your order. Postage is not refunded and repeat purchases are excluded.

How to save more

• If you know you will reorder, a subscription is much cheaper than the one-off price, and you can compare the price per serving on each product page.
• Do not buy the starter pack and a subscription together: the frother and glass come free with the first subscription order.
• Read the subscription terms before signing up so you know how to pause or cancel.

UK orders go by tracked Royal Mail or a similar service and usually take 2 to 4 business days. Questions go through the contact page.

Products, prices and offers checked on the store's own website on 3 Oct 2026. Prices and stock can change.

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