What Type of Collagen Is Best for Bones? Type I and the Trials

Type I collagen is bone's collagen: it makes up about 90% of the organic matrix that gives bone its toughness, and the one adequately sized trial to measure bone density used hydrolysed type I collagen peptides, 5 g a day for twelve months, in 131 post-menopausal women, whose spine and hip density rose while the placebo group's fell.^{1, 2} Once collagen is hydrolysed, type describes the raw material rather than the result, so the practical answer is a plain peptide at 5 g or more a day. No collagen health claim is authorised in Great Britain; the trial is reported here as evidence. What is authorised is the protein claim, "protein contributes to the maintenance of normal bones", which a pure collagen powder qualifies to carry; calcium and vitamin D have their own bone wording and their own job.³

Sources checked on 29 October 2026.

What does collagen do for your bones?

Bone is a composite. Roughly two-thirds of its weight is mineral, calcium phosphate in the form of hydroxyapatite, laid down on a scaffold of type I collagen fibres that make up about 90% of the organic part. The mineral gives bone its stiffness; the collagen gives it toughness, the ability to bend slightly and absorb a knock without cracking.¹ With age the collagen changes too: cross-links accumulate and the matrix becomes more brittle, one reason two people with the same density scan can have different fracture risk.¹ Bone is rebuilt continuously, and a bone-building cell lays down new collagen first, then mineralises it; the standard blood marker of bone formation, P1NP, is a fragment released as that collagen is made.

Is collagen needed for bones?

Structurally, yes: mineral has nothing to attach to without the collagen scaffold, and a body that cannot make enough collagen, as in scurvy, makes weak bone. The body builds that collagen from amino acids, with vitamin C as the cofactor, so the dietary requirement is for protein, alongside the calcium and vitamin D the NHS highlights for healthy bones.⁴ Hence the authorised claim: protein "contributes to the maintenance of normal bones", and a 10 g serving of pure collagen powder supplies a fifth of the 50 g daily reference intake; because collagen lacks tryptophan it adds to meat, fish, dairy, eggs and pulses rather than replacing them.^{3, 5, 12}

Does taking collagen really help bones? What the trials found

The main trial randomised 131 post-menopausal women, average age 64, with low bone density (mean spine T-score of minus 2.4), to 5 g of bovine collagen peptides or placebo every day for twelve months. Density rose at the lumbar spine and femoral neck on collagen and fell at both sites on placebo; the bone-formation marker P1NP rose with collagen and the breakdown marker CTX rose on placebo.² Thirty-one of the women carried on, uncontrolled, in a supplier-linked follow-up, and after four years their spine density had continued to rise and none had an osteoporotic fracture.⁶ Two smaller trials added collagen to calcium and vitamin D rather than replacing them, and found more than calcium and vitamin D alone.^{7, 8}

A consistent, favourable, early picture, and the reason this page says "trials found" rather than "collagen strengthens bones"; the gaps are set out below.

Which type of collagen is best for bone density?

Type I, because it is bone's collagen and the collagen the bone trials used. But it was used because nearly every collagen peptide on sale is type I: bovine hide gives types I and III, bovine bone and fish skin give type I, and hydrolysis cuts all of them into peptides of 2 to 5 kDa. So "marine for joints, bovine for bones" is a myth on both halves: marine collagen is type I too, and no trial has compared sources for bone. A "multi-collagen" blend is a mixture of raw materials, not a broader bone benefit; types of collagen explained covers the rest.

Is it better to take calcium or collagen for bones?

They do different jobs, and the trials that tested collagen on top of calcium and vitamin D found more than calcium and vitamin D alone, so it is not a choice between them.^{7, 8} Calcium is the mineral: "calcium is needed for the maintenance of normal bones" is its authorised wording, and the NHS puts the adult requirement at 700 mg a day.^{3, 9} Vitamin D "contributes to the maintenance of normal bones" and "to normal absorption and utilisation of calcium and phosphorus", and the NHS advises everyone in the UK to consider 10 micrograms a day in autumn and winter; the vitamin D guide covers who needs it all year.^{3, 10} Collagen powder contains almost no calcium; it sits alongside them as the protein and the matrix.

Collagen and osteoporosis: what the trial can and cannot tell you

Osteoporosis is diagnosed by a DEXA scan and managed by a GP or specialist, with medicines where the fracture risk warrants them, and loading exercise is the one non-medical input that raises density, as can you rebuild bone density sets out.⁴ The women in the twelve-month trial had density in the osteopenia-to-osteoporosis range and collagen raised it modestly; the trial did not measure fractures.² So with a diagnosis, collagen is a daily protein that one trial found improved density in women like its participants, and it belongs beside the treatment, calcium and vitamin D you have been advised to take, never in place of them. Collagen has no documented interaction with any medicine; the cautions in is there a downside to taking collagen apply.

See a GP if a bone has broken after a fall or a minor knock, your posture has become stooped or you have lost height, or back pain has lasted: the NHS says osteoporosis "is often only diagnosed when a fall or sudden impact causes a bone to break", that "some older people develop the characteristic stooped (bent forward) posture" and that "broken bones in the spine are a common cause of long-term pain".⁴

Which collagen powder is best for bones?

A hydrolysed peptide taken every day at 5 g or more, the dose the bone trial used. How much collagen to take a day sets each dose beside its trial. The Wellgard collagen guide covers the rest.

What we don't know

Whether collagen prevents fractures: the one adequately sized placebo-controlled trial, with a 22% drop-out and a supplier-linked co-author, measured density, not fractures, and the changes were modest.² Whether it works in men or before the menopause: every bone trial recruited post-menopausal women (collagen and the menopause). Whether less than twelve months is enough: a 2025 six-month trial saw no change in bone-formation markers, a gap in the evidence rather than a finding that collagen does not work.¹¹ No trial has tested collagen alongside osteoporosis medicines.

Frequently asked questions

Does collagen help with bone loss?

One twelve-month trial measured it: women with low bone density took hydrolysed type I collagen peptides at 5 g a day and gained density at the spine and hip while the placebo group lost it; fractures were not measured.² Osteoporosis and osteopenia are diagnosed by a DEXA scan and managed with your GP, who should know you take collagen; it sits beside that plan, and what is osteopenia and can you reverse it explains the T-scores.

Is type 2 collagen good for bones?

No bone trial has used it. Type 2 collagen is cartilage collagen, and undenatured type II at 40 mg is a joint ingredient; the best type of collagen for joints has its trials.

Should a 70-year-old take collagen?

The trial's average age was 64 and the supplier-linked, open-label four-year follow-up of 31 women ran into their late sixties and seventies without an osteoporotic fracture.^{2, 6} Protein needs do not fall with age, and collagen over 70 sets out the trials by decade. Anyone with kidney disease or on a protein-restricted diet should ask their GP first.

Does bone broth give you collagen for bones?

Bone broth contains gelatine in an amount that varies with the bones, the time and the water, and no bone trial has tested it; the trials used a measured 5 g of peptides every day. What are bovine collagen peptides explains the difference.

Sources

1. Viguet-Carrin S, Garnero P, Delmas PD. The role of collagen in bone strength. Osteoporosis International, 2006. Narrative review; funding not stated on PubMed. PubMed 16341622.
2. König D, Oesser S, Scharla S, Zdzieblik D, Gollhofer A. Specific collagen peptides improve bone mineral density and bone markers in postmenopausal women: a randomized controlled study. Nutrients, 2018. Randomised trial, 131 post-menopausal women, 12 months; supplier-linked co-author. PubMed 29337906.
3. Department of Health and Social Care. Great Britain nutrition and health claims (NHC) register, 19 May 2026 edition. gov.uk.
4. NHS. Osteoporosis. nhs.uk. Page last reviewed 13 October 2022 (review overdue).
5. Paul C, Leser S, Oesser S. Significant amounts of functional collagen peptides can be incorporated in the diet while maintaining indispensable amino acid balance. Nutrients, 2019. Modelling study; manufacturer-linked authors. PubMed 31096622.
6. Zdzieblik D, Oesser S, König D. Journal of Bone Metabolism, 2021. Open-label follow-up, 31 women, 4 years; supplier-linked authors. PubMed 34520654.
7. Lampropoulou-Adamidou K, et al. Effect of calcium and vitamin D supplementation with and without collagen peptides on volumetric and areal bone mineral density, bone geometry and bone turnover in postmenopausal women with osteopenia. Journal of Clinical Densitometry, 2022. Randomised trial, 51 post-menopausal women, 12 months; funding not stated on PubMed. PubMed 34980546.
8. Elam ML, et al. A calcium-collagen chelate dietary supplement attenuates bone loss in postmenopausal women with osteopenia: a randomized controlled trial. Journal of Medicinal Food, 2015. Randomised trial, 39 post-menopausal women, 12 months; funding not stated on PubMed. PubMed 25314004.
9. NHS. Calcium. nhs.uk. Page last reviewed 3 August 2020 (review overdue).
10. NHS. Vitamin D. nhs.uk. Page last reviewed 3 August 2020 (review overdue).
11. Duangjai A, et al. Calcium and vitamin D supplementation with and without collagen on bone density and skin elasticity in menopausal women: a randomized controlled study. Clinics and Practice, 2025. Randomised four-arm trial, 6 months; size not stated on PubMed; no conflicts declared. PubMed 41002783.
12. Regulation (EU) No 1169/2011, Annex XIII (assimilated GB law): reference intake for protein, 50 g. legislation.gov.uk/eur/2011/1169/annex/XIII.

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This article is general information, not medical advice. If you have osteoporosis or osteopenia, or take medicines for bone density, speak to your GP or pharmacist before adding any supplement.