Every product here had to earn its place
Kolvi started because buying a supplement means a hundred tabs, mystery blends and labels shouting things they cannot back up. The whole business is the opposite of that.
Every claim we print is one the GB register authorises, in the register's own wording, with the amount that earns it. Everything else is described by its composition, in full.
Six supplements, one scalp serum and one bundle. Made to order in a GMP-certified facility and batch-tested before they ship. Sixty days from delivery to decide it is for you, and you keep anything you have opened.
What a product has to pass
Four tests. A product has to pass all of them before it goes on the shelf, and keep passing them to stay there.
We can see the paperwork
The supplements are made for us in the United States by a manufacturing partner, in a GMP-certified facility, and batch-tested. We ask for the facility certification and the batch documentation before we stock anything, and we will not list a product from a supplier who will not provide them.
The label can be defended
Some of what we sell carries an authorised health claim. Where a product does, its page prints the authorised wording exactly with the amount that earns it. Where it does not, the page gives you the composition: what is in the pack, at what strength, and how it is made.
It fits a real week
If a product needs a chart, a timer or twenty spare minutes, it is not for us. A scoop in the coffee you were making anyway, or two capsules with breakfast.
It works with the rest
Products should overlap on purpose. The Glow Stack is the clearest case: the scalp serum goes on the skin itself while the biotin gummies and the sea moss capsules work through the diet, so one routine covers the outside and the inside at the same time.
What you will not find here
Three things we have decided against, and the reason for each.
No proprietary blends
We will not stock a product that hides its actives behind the word “blend”. A blend that will not show you the figures is usually hiding how small they are.
No borrowed miracles
Where the register authorises no claim, the page describes the thing itself: the botanical, the extract, the standard it is held to, the capsule. The product page tells you exactly what an ingredient is. What it does for you is between you and sixty days.
No autoship by stealth
A subscription is skipped, moved or cancelled from your account without emailing anyone, and the price on the purchase option is the price charged, first delivery included.
Why it takes a few days
Every order is made after it is placed, which is why it takes a few days longer than something pulled off a shelf.
- 1 to 5 working days
- Production starts once the order is in, not before. Made by our manufacturing partner in a GMP-certified facility, and batch-tested.
- 3 to 5 working days
- In transit to the UK and Canada, tracked from the day it leaves the facility. 2 to 4 inside the United States.
- 4 to 10 working days
- Total, to the UK and Canada. 3 to 9 to the United States. Working days are Monday to Friday, not counting public holidays in the United States, where the order is made, or in the UK.
What that buys you
Nothing sits in storage running down its shelf life before it reaches you. The trade is a few extra days for a fresher batch. The order arrives in a plain box with paper tissue and paper tape, no plastic void fill and no branded carrier bag.
See the timings in fullThe whole shelf, and what it costs
The entire range and every price on one screen, so you can see the shape of the business without clicking through twelve tabs.
Prices in pounds sterling. Single-unit prices, read live from the store.
| Product | What it is | Price |
|---|---|---|
| Biotin Gummies | Hair, skin and nails complex, 60 gummies, two a day | £19.99 |
| Ashwagandha Capsules | Withania somnifera root extract, 60 capsules | £22.99 |
| Magnesium Glycinate | Gentle glycinate form, 90 capsules | £21.99 |
| Irish Sea Moss Capsules | Wild-harvested Irish moss with bladderwrack and burdock, 60 capsules | £22.99 |
| Lion’s Mane Capsules | Hericium erinaceus, 60 vegan capsules | £25.99 |
| Collagen Peptides | Hydrolysed peptides, unflavoured powder | £29.99 |
| CROWNED Serum No.1 | Rosemary and ginger scalp serum, 59 ml | £27.99 |
| The Glow Stack | Biotin gummies, sea moss capsules and the scalp serum, priced below the three bought separately | £54.99 |
The bundle costs less than buying its parts, and the saving is already in the price, so there is no code to enter. UK shipping £16.99, free from £49.99 after discounts. Everything is covered by the 60-day guarantee.
Fair questions
The five we get asked most, answered without the marketing.