Metavin Review (UK): What the MV·40 Capsules Are and What We Couldn't Verify

What is Metavin?

Metavin is a capsule food supplement sold online to UK customers. The product photos show amber glass bottles with gold lids and a green label. Here's everything the front of the bottle tells you:

So despite what the old version of this site said about energy, brain fog and sleep, Metavin is positioned as a slimming supplement. In UK law a food supplement is a food: it can't claim to treat or prevent any condition, and it can only use health claims listed on the GB nutrition and health claims register.

Metavin ingredients: what we could find

We couldn't verify a single Metavin ingredient. We searched UK pharmacies, high-street health retailers, Amazon UK, supplement databases and the wider web (checked 6 November 2026). None publishes a Metavin ingredient list, and the side label in the product photos is too small and curved to read.

What the “MV·40” code refers to – a dose, a blend number or just branding – isn't explained anywhere we could find. Products marketed for “fat burn” in the UK typically contain caffeine sources (green tea, guarana, green coffee), plant extracts such as Garcinia or apple cider vinegar, and sometimes chromium or B vitamins. We can't tell you whether Metavin contains any of these.

Before you order, look for a full list with amounts per daily dose – and pay special attention to caffeine, which some slimming capsules contain in large amounts.

How Metavin is meant to work – and what UK rules allow

The label promises three things: fat burn, digestion and vitality. Under the UK rules on nutrition and health claims, a food supplement can only make a health claim if it's on the GB nutrition and health claims register and the product contains enough of the relevant ingredient.

“Fat burn” isn't an authorised claim for any ingredient. The few weight-related claims that are authorised are tightly worded – for example, glucomannan in the context of an energy-restricted diet at 3 g a day – and we have no evidence that Metavin contains any such ingredient. Claims like “vitality” and “digestion” are general wording that, under the rules, should be backed by a specific authorised claim next to them. Without the ingredient list we can't see one.

How to take Metavin

The bottle says 60 capsules for 30 days, so the daily dose is most likely two capsules. Follow the directions printed on your own bottle.

• Don't take more than the stated dose.
• If the label lists caffeine, guarana, green tea or green coffee, count it alongside your tea, coffee and energy drinks.
• Don't combine it with other slimming supplements.
• Stop taking it and speak to your GP or pharmacist if you feel unwell.

Who might consider Metavin – and who should avoid it

Does Metavin work? What the evidence shows

There is no published study of Metavin, and the “Evidence-Based Nutrition” badge on the bottle doesn't link to any research we could find. The old version of this site claimed 10,000+ UK customers, a 4.8-star rating from 1,247 reviews and results within 2–4 weeks; none of it was verifiable, so we've removed it.

We also found no Trustpilot page and no independent customer reviews. With no confirmed ingredients and no data, the honest answer is: unknown. NHS advice for weight loss remains a calorie-controlled diet and regular activity – supplements aren't part of it.

Is Metavin legit?

Metavin appears to be a real, orderable product – there are professional product photos and an official order page. But we couldn't identify the company behind it, find a company called Metavin on Companies House (only two dissolved companies with similar names), or locate it at any UK retailer. The old site's claims of UK dispatch, free delivery, GMP manufacturing and a 30-day money-back guarantee couldn't be verified.

That isn't proof of a scam, but it does mean you're relying on the seller's own word. Note the trading name and address on the checkout page, and pay by credit card or PayPal for the extra protection.

Side effects and safety

We can't assess Metavin's safety properly without its ingredient list. As a guide, the ingredients commonly used in “fat burn” capsules can cause jitters, palpitations, headaches and poor sleep (caffeine and guarana), stomach upset (fibres, vinegar extracts) and, rarely, liver problems (concentrated green tea extract and Garcinia have both been linked to case reports).

Stop taking any slimming supplement and see your GP if you notice yellowing skin or eyes, dark urine, severe tiredness or pain under the right ribs. If you take medication – especially for the heart, blood pressure, blood sugar or mood – ask your pharmacist before trying it.

Pros and cons

Metavin price and where to buy in the UK

Our searches found no Metavin listing at UK high-street chemists, health-food chains, online pharmacies or Amazon UK, so the official site linked here appears to be the only route. We don't quote a price because we couldn't confirm one; check the total at checkout, including delivery.

• Cancellation rights: for most online purchases you have 14 days to cancel under the Consumer Contracts Regulations, but sealed health products may be excluded once opened.
• Subscriptions: check you aren't signing up for repeat deliveries, and note how to cancel.
• Refunds: read the written refund policy – don't rely on a guarantee badge.
• Label: when your order arrives, check the ingredient list and the UK or EU address of the responsible business.