Is Collagen Good for Your Gums? What One Trial Found

Collagen is what your gums are largely made of, and one randomised trial has tested it as a supplement for gums: 39 adults in periodontal aftercare took 5 g of collagen peptides a day for 90 days after a professional clean, and bleeding sites fell from 10.4% to 3.0%, against 14.2% to 9.4% on placebo.¹ That is a favourable early finding on bleeding and inflammation, not yet repeated, and silent on recession. Receded gums do not grow back without a dental procedure, and bleeding gums are a reason to see a dentist. The wider evidence is in the Wellgard collagen guide.

What are gums made of, and why does gum disease break them down?

The gum, the ligament that holds each tooth in its socket and the jawbone are collagen-rich tissues. Fibroblasts in the gum and ligament make that collagen, renew it and adjust it to the strain of chewing.² Plaque-driven inflammation switches on the body's own collagen-cutting enzymes, and in active periodontitis MMP-8 and MMP-9 run five to six times higher than in healthy gums.³ Gum disease destroys collagen from the outside in, so dentists treat the plaque and inflammation, not the collagen, following the UK treatment guideline.^{3, 13}

Does collagen help gum disease? What the one trial found

One randomised, placebo-controlled trial, published in 2022, is the human evidence so far.¹ It enrolled 39 adults in periodontal maintenance: gum disease already treated, back for recall appointments. Everyone had a professional clean; 20 then took a 5 g sachet of collagen peptides dissolved in a drink once a day for 90 days, and 19 took a placebo.

Bleeding on probing was the primary outcome. Bleeding sites fell from 10.4% to 3.0% with collagen and from 14.2% to 9.4% with placebo (effect size 0.86). Periodontal inflamed surface area fell from 170.6 mm² to 53.7 mm² against 229.4 mm² to 184.3 mm², and the gingival index to 0.1 against 0.3. Plaque fell in both groups with no difference between them, and no adverse events were recorded. The authors conclude the peptides may add to the anti-inflammatory effect of professional cleaning.¹

It is small, it ran 90 days, it was funded by the ingredient's manufacturer, and nobody has repeated it. There is no human trial yet of collagen taken by mouth with pocket depth, attachment, bone, recession or tooth loss as an endpoint. Collagen itself has no authorised health claim in Great Britain, a fact about the register, not a verdict on the trial.¹¹ The fair summary: a well-run early trial in collagen's favour on bleeding gums, waiting for a second.

Can receding gums grow back?

Not on their own, and not with a supplement. The tissue that has gone does not regrow. It is common: in a 2025 meta-analysis of 22 studies, 81% of adults had at least 1 mm of recession, 48% at least 3 mm and 16% at least 5 mm, and the strongest associations were periodontitis (odds ratio 9.90), a high frenulum (4.58), plaque (4.26), a bite that overloads a tooth (3.20), alcohol (2.04) and smoking (1.84).⁴

What a dentist can do is cover the root surgically, with a graft of the patient's own connective tissue. Across 16 randomised trials (632 patients, 1,878 recessions) that graft covered 11 to 13 percentage points more of the root at 6 to 12 months than the collagen-based substitutes,⁵ and over 5 to 20 years it keeps complete coverage in at least two thirds of patients.⁶ No supplement trial has recession as its main outcome; the collagen trial recorded recession only as an input to its inflammation score.¹ A receded gum needs a dentist, who will look for the cause first.

Is the collagen a dentist uses the same as a collagen supplement?

No. Three different things share the name.

Results from a membrane or graft never transfer to a sachet. When a page says collagen "regenerates gum tissue" over a surgical paper, it is describing the device.

What vitamin helps bleeding gums?

Vitamin C, and it carries the only authorised gum wording on the GB register: "Vitamin C contributes to normal collagen formation for the normal function of gums", a claim that belongs to vitamin C.¹¹ Bleeding gums are a classic sign of scurvy, seen today mainly in older, malnourished or alcohol-dependent people.¹⁰ Short of scurvy, a 2021 meta-analysis of 15 trials in 1,140 mostly healthy people found vitamin C supplements reduced gum bleeding tendency when plasma vitamin C started below 28 µmol/L (standardised mean difference -0.83), and not clearly when it was already above 48 µmol/L.⁸ A 2019 review of 14 studies found vitamin C improved gingival bleeding in gingivitis but not in periodontitis, and did not improve bone loss.⁹ Calcium, phosphorus, magnesium and vitamin D carry "maintenance of normal teeth" wording; nothing else on the register names gums.¹¹ More in what vitamin C is good for and what destroys collagen and how to protect it.

When should you see a dentist about your gums?

Early. The NHS puts it plainly: "Gum disease is where your gums become red, swollen and sore, and bleed. It's very common, but it's important to get it checked by a dentist."¹² Its "See a dentist if" list is:

• "your gums bleed when you brush your teeth or eat hard foods"
• "your gums are painful and swollen"
• "you have bad breath"
• "your child has sore, bleeding gums"

"Ask for an urgent dentist appointment if" you have gum disease and "very sore and swollen gums", "teeth becoming loose or falling out", "ulcers or red patches in your mouth" or "a lump in your mouth or on your lip"; with no dentist, "call 111".¹² Prevention is fluoride toothpaste at least twice a day ("spit after brushing, do not rinse"), cleaning between the teeth every day, check-ups "especially if you're pregnant or have type 2 diabetes", and "do not smoke".¹² Collagen, if you take it, sits alongside that plan.

What is the worst thing for receding gums?

Smoking. Across the 14 longitudinal studies a 2018 review could pool, it raised the risk of periodontitis by 85% (risk ratio 1.85),¹⁴ and in the recession meta-analysis smoking and alcohol sat alongside plaque and periodontitis as the factors most linked with gums moving down the root.⁴ Diabetes roughly triples susceptibility to periodontitis.¹⁵ After the menopause, nine observational studies found more attachment loss, deeper pockets and more inflammation in women not using HRT, at low to moderate certainty;¹⁶ more in collagen and the menopause. Side effects and who should ask a GP first are in is there a downside to taking collagen.

What we don't know

Whether the collagen trial replicates independently; whether its effect holds in untreated gum disease, in healthy gums, or beyond 90 days; whether collagen peptides change pocket depth, attachment, bone or recession; which dose, source or format suits gums; and the vitamin C intake that minimises gum bleeding in people who are not deficient. These are gaps in the research, not findings against it.

Frequently asked questions

Can collagen regrow receding gums?

No. Receded gum tissue does not grow back by itself or with any supplement; the route that restores coverage is a surgical graft, and no supplement trial has recession as its main outcome.^{1, 4, 5}

Does vitamin C help bleeding gums if you are not deficient?

Less clearly. It helps where status is low: across 15 trials, supplements reduced gum bleeding tendency when plasma vitamin C was below 28 µmol/L and not clearly when it was already above 48 µmol/L.⁸ Bleeding gums still need a dentist, whatever your vitamin C.¹²

Which type of collagen is best for gums?

Gums and the tooth ligament are built from type I and type III collagen.² The one gum trial used hydrolysed collagen peptides, and no trial has compared types or sources for gums, so that question has not yet been tested.¹

Does the NHS recommend collagen for gums?

The NHS gum disease page mentions no supplement of any kind; its advice is fluoride toothpaste, cleaning between the teeth, not smoking and seeing a dentist.¹² The NHS's wider position is in does the NHS recommend collagen.

Is collagen good for your teeth?

The register wording for teeth belongs to vitamin C ("normal collagen formation for the normal function of teeth") and to calcium, phosphorus, magnesium and vitamin D ("maintenance of normal teeth"); no trial has tested a collagen supplement with a tooth outcome.¹¹

Sources

1. Jockel-Schneider Y, et al. Impact of a specific collagen peptide food supplement on periodontal inflammation in aftercare patients: a randomised controlled trial. Nutrients, 2022. PubMed 36364735.
2. Hinz B. Matrix mechanics and regulation of the fibroblast phenotype. Periodontology 2000, 2013. PubMed 23931051.
3. Sorsa T, et al. Matrix metalloproteinases in periodontal and peri-implant diseases. Journal of Periodontal Research, 2026. PubMed 41556479.
4. Marschner F, et al. Prevalence and risk factors for gingival recession: systematic review and meta-analysis. Journal of Dentistry, 2025. PubMed 39988303.
5. Koppolu P, et al. Connective tissue grafts versus soft tissue substitutes for multiple gingival recessions: a meta-analysis. Medicina, 2026. PubMed 41752765.
6. Bertl K, et al. Root coverage stability: controlled clinical trials with at least 5 years of follow-up. Clinical and Experimental Dental Research, 2021. PubMed 33565266.
7. Kunrath MF, et al. Membranes for periodontal and bone regeneration. Journal of Periodontal Research, 2025. PubMed 40525277.
8. Hujoel PP, et al. Bleeding tendency and ascorbic acid requirements: meta-analysis of clinical trials. Nutrition Reviews, 2021. PubMed 33517432.
9. Tada A, et al. The relationship between vitamin C and periodontal diseases: a systematic review. International Journal of Environmental Research and Public Health, 2019. PubMed 31336735.
10. Gandhi M, et al. Scurvy: rediscovering a forgotten disease. Diseases, 2023. PubMed 37366866.
11. Commission Regulation (EU) No 432/2012, annex: authorised health claims as retained in Great Britain. legislation.gov.uk.
12. NHS. Gum disease. nhs.uk.
13. West N, et al. BSP implementation of European S3 periodontitis guidelines in UK clinical practice. Journal of Dentistry, 2021. PubMed 33573801.
14. Leite FRM, et al. Effect of smoking on periodontitis: a systematic review and meta-regression. American Journal of Preventive Medicine, 2018. PubMed 29656920.
15. Preshaw PM, et al. Periodontitis and diabetes: a two-way relationship. Diabetologia, 2012. PubMed 22057194.
16. Martín FC, et al. Impact of menopause on clinical periodontal outcomes: a systematic review. Clinical Oral Investigations, 2026. PubMed 41870718.