What Is Gelatine, and Is It the Same as Collagen?

Gelatine is collagen that heat has partly broken down, so it dissolves in hot water and sets as it cools. Hydrolysed collagen, sold as collagen peptides, is gelatine cut further by enzymes into short peptides that dissolve readily and do not set. The two carry the same amino acids; what differs is the size of the molecules and how they behave in water.^{1, 2, 3} This page sits beneath the Wellgard collagen guide.

Evidence at a glance

• Trials: gelatine in three exercise studies (8 to 22 people), one absorption study (9), one diet trial (72) and two urine studies; hydrolysed collagen in 35 pooled osteoarthritis trials (3,165 people) and 26 pooled skin trials (1,721).^{4, 5, 6, 7, 8, 9, 10, 11, 12}
• Largest single gelatine trial: 72 adults on an eight-week weight-loss diet.⁸
• Strongest measured outcome: 15 g of vitamin C-enriched gelatine before exercise doubled a collagen-synthesis marker in 8 men; pooled collagen trials improved osteoarthritis function (SMD -0.31, high certainty).^{4, 11}
• Not tested: gelatine against hydrolysed collagen on any skin, joint or bone outcome.

Sources checked on 13 October 2026.

How is gelatine made from collagen?

Skin, hide or bone is washed and pre-treated, with acid for pig and fish skin or alkali for the more cross-linked bovine hide, giving type A and type B gelatine. Hot water then unwinds collagen's triple helix and draws it out as gelatine, which is filtered, dried and ground to powder or made into sheets.^{1, 2} Worldwide, pig skin supplies about 46% of gelatine, bovine hide 29.4%, bovine bone 23.1% and fish 1.5%.¹ For collagen peptides, food enzymes then cut the chains, and enzyme, time and temperature set their length.³ Bovine collagen peptides follows the process step by step.

Is gelatine the same as collagen?

Chemically yes, physically no. Native collagen is three chains wound into a rigid helix that does not dissolve. Gelatine is that helix unwound into long chains, the fractions above 30 kDa; hydrolysed collagen is the same protein cut into peptides of a few kilodaltons (what collagen peptides are).^{2, 3} Long gelatine chains trap water as they cool and form a gel that melts again on warming, at 32 to 35 °C for gelatine from mammals and lower for fish gelatine. Peptides are too short to do that: they dissolve readily, stay runny and never set.^{1, 3} All three carry collagen's amino acids, about a third of them glycine, with proline and hydroxyproline.¹

Is gelatine absorbed like hydrolysed collagen?

It delivers the same collagen fragments to the blood, at different levels. In a Japanese crossover study of nine volunteers, plain gelatine raised the dipeptide prolyl-hydroxyproline (Pro-Hyp) to 15.5 nmol/mL two hours after eating. A low-molecular-weight gelatine hydrolysate raised both measured peptides higher, and both hydrolysates raised free hydroxyproline more; the authors concluded that gelatine is as useful a functional food as a standard hydrolysate.⁷ In a study of 10 active men, equal doses of gelatine and hydrolysed collagen raised blood amino acids similarly in the four whose amino acids were measured.⁵

What have trials of gelatine measured?

The best-known study gave eight healthy men 5 g or 15 g of vitamin C-enriched gelatine, or a placebo, an hour before six minutes of rope-skipping, three times a day for three days. After 15 g, a blood marker of new collagen formation (P1NP) doubled.⁴ With 15 g of gelatine or hydrolysed collagen, each with vitamin C, the same laboratory saw the marker tend to rise about 20% after both in 10 men, short of significance.⁵ In a university-funded 2026 pilot, 22 adults took 15 g of gelatine with 50 mg of vitamin C twice a day for eight days around a hard leg workout; soreness, strength and P1NP did not differ significantly from placebo, though exploratory comparisons favoured gelatine at some time points.⁶

In an eight-week weight-loss trial of 72 adults, a diet whose protein included gelatine produced the same fall in body mass index as two milk-protein diets.⁸ Foods high in collagen covers skin and slow-cooked cuts, and is bone broth a good source of collagen what a mug of broth contains.

What have trials of hydrolysed collagen measured?

Far more outcomes, with pooled results in collagen's favour. A 2024 meta-analysis of 35 randomised trials in 3,165 people with osteoarthritis found that collagen derivatives, hydrolysed collagen pooled with undenatured type II, reduced pain (standardised mean difference -0.35, moderate certainty) and improved function (-0.31, high certainty), with no more adverse events or withdrawals than control.¹¹ A 2023 meta-analysis of 26 randomised trials in 1,721 people found daily hydrolysed collagen improved measured skin hydration and elasticity against placebo, whatever the collagen source.¹² On the training marker, 30 g with vitamin C raised P1NP more than 15 g or none in 10 trained men.¹³ Collagen has no authorised health claim in Great Britain; the joint and skin claims assessed, including two dossiers in 2011 and 2013, were not authorised, and these meta-analyses came later.¹⁴

Is gelatine halal, kosher or vegetarian?

It depends on the animal, which "gelatine" on a label does not name. Pig skin is the largest source; Muslims and Jews do not eat pork products and Hindus avoid bovine ones, and the review authors describe fish gelatine as potentially suitable for all three.¹ Under the majority scholarly view, porcine gelatine is haram, bovine gelatine is halal only with certified slaughter and processing, and fish gelatine is generally halal; is gelatine halal sets out where scholars differ. Kosher status follows the same logic, with a certificate as the evidence. Gelatine is animal-derived, so it is neither vegetarian nor vegan; agar, pectin and carrageenan are plant gelling agents and contain no collagen (is gelatine vegan).

How do you cook with gelatine and collagen peptides?

Softened in cold water and dissolved in hot liquid, gelatine sets jellies, panna cotta and mousses as they cool. Collagen peptides set nothing, so they stir into hot or cold drinks, soups and porridge without changing the texture; a recipe that has to set still needs gelatine.^{1, 3} In a ready-made jelly, check where gelatine sits in the ingredients list, which runs in descending order of weight.¹⁵

What we don't know

• No trial has compared gelatine with hydrolysed collagen on a skin, joint or bone outcome; the head-to-head studies measured blood peptides in 9 people and a synthesis marker in 10 men.
• A PubMed search on 13 October 2026 found no randomised trial of plain gelatine with skin, joints or bone as its main outcome.
• Every gelatine exercise study put vitamin C in the drink, so gelatine without it has not been tested on the synthesis marker.

Frequently asked questions

Is gelatine good for your joints or skin?

The pooled skin and joint trials tested hydrolysed collagen and undenatured type II, not plain gelatine.^{11, 12} Gelatine's own studies measured a collagen-synthesis marker and exercise recovery in 8 to 22 people.^{4, 5, 6} The amino acids are the same.

Is it safe to eat gelatine every day?

Large loads change urine chemistry. In one controlled-diet study, 30 g of gelatine raised urinary oxalate by 43% compared with whey, with changes from 5 g loads and none at 1 or 2 g; in another, 30 g a day for three days left oxalate unchanged in five men.^{9, 10} People who form calcium-oxalate kidney stones should keep to moderate amounts and ask their GP before changing their diet.

Is gelatine a complete protein?

No. Gelatine has collagen's amino acid profile, which lacks tryptophan, so it adds to dietary protein rather than covering every essential amino acid; one modelling study found up to 36% of daily protein could come from collagen peptides with those needs still met.¹⁶ A label counts protein at 4 kcal per gram.¹⁵

How much gelatine gives 10 g of collagen?

Divide 10 by the protein per gram on the pack, since gelatine's protein is collagen. At a declared 85 g of protein per 100 g, that is about 12 g of powder.

Sources

1. Al-Nimry S, et al. Marine Drugs, 2021. Review; no external funding. PubMed 33800149.
2. Joy JM, et al. Foods, 2024. Review; no conflicts declared. PubMed 39272559.
3. León-López A, et al. Molecules, 2019. Review; no conflicts declared. PubMed 31703345.
4. Shaw G, et al. American Journal of Clinical Nutrition, 2017. Randomised crossover, 8 men, 3 days; US government (NIH) grant on record, no conflicts declared. PubMed 27852613.
5. Lis DM, Baar K. International Journal of Sport Nutrition and Exercise Metabolism, 2019. Randomised crossover, 10 men, single doses; funding not checked. PubMed 30859848.
6. Graham RR, et al. European Journal of Applied Physiology, 2026. Randomised pilot trial, 22 adults, 8 days; university-funded, no conflicts declared. PubMed 42228163.
7. Iwasaki Y, et al. Food Chemistry, 2022. Crossover absorption study, 9 people, single doses; funding not checked. PubMed 34461513.
8. Hochstenbach-Waelen A, et al. British Journal of Nutrition, 2011. Randomised trial, 72 adults, 8 weeks; funded by a Dutch public-private food research institute, no conflicts declared. PubMed 21272400.
9. Knight J, et al. Kidney International, 2006. Controlled-diet study, healthy adults (number not in the abstract); NIH grants on record, funding statement not checked. PubMed 17021603.
10. Rodgers A, et al. International Urology and Nephrology, 2019. Intervention study, 5 men, 3 days; funding not checked. PubMed 31161522.
11. Liang CW, et al. Osteoarthritis and Cartilage, 2024. Pooled analysis, 35 randomised trials, 3,165 people; funding not checked. PubMed 38218227.
12. Pu SY, et al. Nutrients, 2023. Pooled analysis, 26 randomised trials, 1,721 people; hospital-funded, no conflicts declared. PubMed 37432180.
13. Lee J, et al. Journal of Nutrition, 2024. Randomised crossover, 10 men, single doses; no funding received, no conflicts declared. PubMed 38007183.
14. Department of Health and Social Care. Great Britain nutrition and health claims (NHC) register, last updated 19 May 2026. gov.uk.
15. Regulation (EU) No 1169/2011 on food information to consumers, Article 18 and Annex XIV (assimilated law in Great Britain). legislation.gov.uk.
16. Paul C, Leser S, Oesser S. Nutrients, 2019. Modelling study; one author provides research services to a supplement company. PubMed 31096622.

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