Updated 6 September 2026. Prices and doses were taken from each brand's own UK website on that date and will drift; we re-check this table monthly. KUDU makes one of the products below, so read our reasoning and check the sources yourself.
The short answer
- Highest dose: KUDU, 20,000mg per sachet. Most UK liquid collagens are 5,000mg to 10,000mg.
- Lowest price per gram of collagen: KUDU (12.5p per 1,000mg), then Benjamin Button (13.7p) and Reverse Life (14.5p). The average across the 16 products is about 31p.
- Batch tested for sport: KUDU (Informed Sport), Kollo (Informed Choice) and Primabiotic Collagen Sport (TruShield). The rest carry no banned-substance certification.
- Most reviewed on Trustpilot: Reverse Life (20,000+), Free Soul (4,500+), Absolute Collagen (4,300+). KUDU has 43 Trustpilot reviews and 477 verified product reviews on its own site.
- Best for skin at a lower dose: Absolute Collagen (clinically studied 8,000mg marine formula), Kollo and Free Soul are the strongest marine options.
UK liquid collagen comparison table (September 2026)
| Product | Collagen source | mg per serving | Servings per pack | One-off price | Price per serving | Price per 1,000mg collagen | Banned-substance certification | Positioned for |
|---|---|---|---|---|---|---|---|---|
| KUDU 20g Liquid Collagen Protein | Bovine | 20,000 | 14 | £34.95 | £2.50 | 12.5p | Informed Sport | Training, recovery, joints, tendons |
| Benjamin Button 12,000mg Marine Collagen | Marine | 12,000 | 14 | £22.95 | £1.64 | 13.7p | None (halal) | Skin, value marine option |
| Reverse Life Marine Collagen Original (500ml bottle) | Marine | 10,000 | 20 | £29.00 | £1.45 | 14.5p | None stated | Skin, hair, nails; bottle not sachet |
| Zooki Super Strength Collagen 11,000mg | Marine | 11,000 | 14 | £31.99 (from) | £2.29 | 20.8p | None stated | Skin; higher-dose marine |
| Primabiotic Collagen Sport 12,000mg | Bovine | 12,000 | 30 | £79.99 | £2.67 | 22.2p | TruShield banned-substance tested | Active users; adds magnesium, zinc |
| Proto-col Marine Beauty Collagen | Marine | 10,000 | 15 | £33.95 | £2.26 | 22.6p | None stated | Skin (Verisol F peptides) |
| Primabiotic Collagen Shots 10,000mg | Bovine | 10,000 | 30 | £69.99 | £2.33 | 23.3p | Lab tested | General wellbeing |
| Kollo Health Premium Liquid Marine Collagen 10,000mg | Marine | 10,000 | 14 | £33.53 | £2.40 | 24.0p | Informed Choice | Skin, hair, nails; Naticol peptides |
| Free Soul Marine Liquid Collagen 8,000mg | Marine | 8,000 | 14 | £32.49 | £2.32 | 29.0p | None stated | Skin; Good Housekeeping 2026 winner |
| Revive Collagen Original 8,500mg | Marine | 8,500 | 14 | £35.69 | £2.55 | 30.0p | None stated (halal suitable) | Skin, hair, nails |
| Revive Collagen Enhanced Plus 10,000mg | Marine | 10,000 | 14 | £41.99 | £3.00 | 30.0p | None stated | Skin; adds extra actives |
| Absolute Collagen Marine Collagen Liquid Drink 8,000mg | Marine | 8,000 | 14 | £33.99 | £2.43 | 30.3p | None sport (B Corp, halal) | Skin; clinically studied 8g dose |
| New Nordic Collagen Shot | Marine | 5,000 | 15 | £30.89 | £2.06 | 41.2p | None stated | Skin; adds biotin |
| Zooki Collagen 5,000mg | Marine | 5,000 | 14 | £29.99 | £2.14 | 42.8p | None stated | Skin; entry dose |
| Skinade 30 Day Supply | Marine | 7,000 | 30 | £129.99 | £4.33 | 61.9p | None stated | Skin; 150ml bottles |
| Gold Collagen Pure | Marine | 5,000 | 10 (inferred) | £39.00 | £3.90 | 78.0p | None stated | Skin, hair, nails |
Price per 1,000mg = one-off price ÷ servings per pack ÷ (mg per serving ÷ 1,000). Subscription prices are typically 15 to 20% lower for every brand. Zooki Super Strength 14-pack price is a "from" price on its collection page; Gold Collagen pack count is inferred from retailer listings; Revive Original shows a lower promotional price on the page than in its catalogue. Sources: each brand's UK product page, fetched 6 September 2026.
How to read the table
1. Dose decides what the product can do
The research on collagen and the body's connective tissue used 10g to 20g of collagen peptides per day, usually taken before training (see the studies on our research page). Skin studies used 2.5g to 10g. So a 5,000mg shot is a skin product; a 10,000mg to 12,000mg shot is a strong skin product with some joint support; a 20,000mg shot is a performance dose. Buying a 5,000mg shot for joint pain means taking three or four a day, which changes the price maths completely.
2. Marine versus bovine
Marine collagen (from fish skin) is mainly type I and dominates the UK beauty market. Bovine collagen provides types I and III, is the source used in most sports-science trials, and is far cheaper per gram, which is how KUDU fits 20g into a 63ml sachet at £2.50. Neither is "better" in the abstract; pick the source that matches your goal and dose.
3. Certification matters if you compete
Informed Sport (KUDU) tests every production batch for WADA-banned substances. Informed Choice (Kollo) tests samples monthly. TruShield (Primabiotic Sport) is a similar programme. If you are drug-tested, treat anything without one of these marks as a risk.
4. Price per gram, not price per box
Boxes cost £23 to £42 for 14 servings, which looks similar on the shelf. Divide by collagen content and the spread is six-fold: 12.5p to 78p per 1,000mg. That is the number to compare.
Where each product wins
- KUDU 20g Liquid Collagen Protein: the performance choice. 20g bovine collagen, 85 kcal, zero sugar, Informed Sport, ready to drink, lowest price per gram. Also the only one that doubles as a 20g protein serving. Weakness: fewer Trustpilot reviews than the big beauty brands, and it is not marine if that matters to you.
- Absolute Collagen: the most established UK marine brand, with its own clinical trial on the 8,000mg formula and B Corp status. Best for skin at a moderate dose. Around 30p per 1,000mg.
- Kollo Health: 10,000mg Naticol marine peptides with 80mg vitamin C and Informed Choice certification. The strongest marine option for someone who also trains. 24p per 1,000mg.
- Zooki Super Strength: 11,000mg marine in a sachet with a loyal following; good if you want a high marine dose. Around 21p per 1,000mg.
- Benjamin Button and Reverse Life: the value marine picks at 13.7p and 14.5p per 1,000mg. Reverse Life is a bottle rather than sachets, so less convenient to carry.
- Free Soul: Good Housekeeping's 2026 winner for hair and skin plumpness; 8,000mg marine at 29p per 1,000mg.
- Primabiotic Collagen Sport: the other performance-positioned option, 12,000mg bovine with magnesium and zinc and TruShield testing, but at 22p per 1,000mg and 2.6g sugar per shot.
- Skinade and Gold Collagen: premium skin drinks at 62p and 78p per 1,000mg; you are paying for the formula and brand rather than the collagen.
Frequently asked questions
Which UK liquid collagen has the highest dose per serving?
KUDU, at 20,000mg (20g) of hydrolysed bovine collagen per 63ml sachet. The next highest ready-to-drink options are Benjamin Button and Primabiotic Collagen Sport at 12,000mg, then Zooki Super Strength at 11,000mg.
Which UK liquid collagen is cheapest per gram?
On brand-site one-off prices checked on 6 September 2026, KUDU is cheapest at about 12.5p per 1,000mg, followed by Benjamin Button (13.7p) and Reverse Life (14.5p). Most marine collagen shots cost 20p to 45p per 1,000mg; Skinade and Gold Collagen are above 60p.
Is marine or bovine liquid collagen better?
Both are hydrolysed into peptides the body absorbs. Marine collagen is mostly type I and is marketed for skin. Bovine collagen provides types I and III and is the source used in most of the sports-science studies on tendons, ligaments and muscle. Dose and consistency matter more than source; the studies on athletes used 10g to 20g per day.
Which liquid collagens are safe for drug-tested athletes?
Only three products in this comparison carry a third-party banned-substance certification: KUDU (Informed Sport), Kollo (Informed Choice) and Primabiotic Collagen Sport (TruShield). Informed Sport tests every batch, which is the standard most governing bodies recommend.
What is the best liquid collagen for joints and recovery in the UK?
For joints, tendons and post-training recovery, the evidence supports 10g to 20g of collagen peptides per day taken 30 to 60 minutes before exercise. KUDU is the only UK ready-to-drink option that delivers 20g in one sachet and is batch tested for sport, which is why it is the pick for that goal. For skin-focused goals at lower doses, Absolute Collagen, Kollo and Free Soul are the most reviewed marine options.
Try the 20g dose
The KUDU Sampler Box is £12 for all four flavours, and every first order is covered by a 60-day money-back guarantee. Full brand facts, certifications and stockists are on our about page.
20g per shot
Ready to try it?
20g Liquid Collagen Protein
4.7 from 495 reviews
- 20g hydrolysed bovine collagen per shot
- Ready to drink in two sips. 85 kcal, 0g sugar
- Informed Sport certified
Pick a flavour
£34.95 for 14
or £1.99 a shot on subscription
Free UK delivery over £50 · 60-day money-back guarantee · Pause or cancel any time
