Can You Take Collagen With Blood Pressure Tablets or Statins?

No interaction between collagen peptides and any blood pressure tablet, statin or anticoagulant has been documented. PubMed searches on 11 October 2026 found no trial or case report of one, and the BNF interaction pages for six commonly prescribed medicines in these classes, checked again on 12 October 2026, do not contain the word collagen.¹ Collagen is a food protein and contains no cholesterol. "Documented" matters: no interaction study has ever been designed, so the absence is a search result, not a guarantee. Each NHS medicine page gives the same instruction in near-identical words: "tell your doctor if you're taking any other medicines, herbal remedies, vitamins or supplements".² Your pharmacist confirms it for your own prescription; show them the label, especially for a blend. This page sits beneath the Wellgard collagen guide, next to the medicines table on collagen and medicines.

Is there a known interaction between collagen and blood pressure tablets?

No documented one. Five PubMed searches on 11 October 2026, for collagen peptides with drug interactions and case reports, anticoagulants, statins and antihypertensives, returned 3, 4, 2 and 31 records, and none described an interaction in a person; the antihypertensive results were laboratory studies or reviews.¹ The BNF has no collagen entry: its pages for warfarin, amlodipine, ramipril, atorvastatin, simvastatin and apixaban were fetched on 12 October 2026 and none mentions collagen.¹

Neither NHS page for the two most prescribed classes mentions protein. For the calcium channel blocker amlodipine (page reviewed 9 June 2026), the food named is grapefruit: "Do not eat grapefruit or drink grapefruit juice while taking amlodipine".² For the ACE inhibitor ramipril (reviewed 18 March 2026): "There's very little information about taking herbal remedies and supplements with ramipril", and "They're not tested in the same way as pharmacy and prescription medicines".³

Can you take collagen with statins?

None documented, and no statin page names collagen or protein as a food to limit. The NHS statins page (reviewed 5 May 2026) names St John's wort and grapefruit among the things that can interfere, then says, "Always ask a pharmacist or your doctor if you're unsure".⁴ The atorvastatin page (reviewed 23 June 2026) says "You can eat as normal while taking atorvastatin" and to "avoid having too much grapefruit juice"; the simvastatin page (reviewed 12 May 2026) says "avoid drinking grapefruit juice as it can stop the medicine working properly".^{5, 6}

No trial has shown bovine collagen raising cholesterol. Collagen is protein; cholesterol travels with animal fat, and a plain hydrolysed collagen powder is fat-free apart from traces. In the most carefully measured trial, 56 adults took 10 g of collagen hydrolysate a day for four weeks and their serum lipids did not change.⁷ A 2023 pooled analysis of twelve trials estimated a small fall in LDL cholesterol (4.09 mg/dL), but the trials disagreed so widely (I² 93.4%) that the figure is unreliable in either direction.⁸

Can you take collagen with blood thinners?

No documented interaction. The NHS warfarin page (reviewed 24 February 2026) names two supplements to avoid, "Do not take the herbal remedy St John's wort or vitamin K supplements", and explains that warfarin needs "regular blood tests to measure how quickly your blood clots", the INR test.⁹ Collagen contains no vitamin K; a blend might. The apixaban page (reviewed 21 January 2026) asks you to "tell your doctor or a pharmacist if you're taking any other medicines, herbal remedies, vitamins or supplements" and, on food, "You can eat and drink as normal while taking apixaban".¹⁰

The "collagen and warfarin" warning that circulates online belongs to glucosamine, a common partner in joint blends. A 2008 case report and review found 20 reports of altered clotting with glucosamine products in the US FDA's safety database and 21 of a raised INR in the World Health Organization's, 17 of them resolving when glucosamine was stopped.¹¹ Glucosamine and warfarin sets out what that means for a blend. No trial or case report has shown collagen peptides to change clotting or the INR. Tell your anticoagulant clinic what you take.

Does collagen lower or raise blood pressure?

The trials can be described; they do not settle it either way. The best-measured one randomised 56 middle-aged and older adults with overweight or obesity to 10 g of porcine collagen hydrolysate or an erythritol control daily for four weeks, with 24-hour ambulatory monitoring. Office systolic pressure changed by -1 mmHg (95% CI -3 to 2), diastolic by -1 (-2 to 1), 24-hour systolic by 0 (-4 to 4) and 24-hour diastolic by -2 (-5 to 1); none was significant, and the other markers were unchanged.⁷ The 2023 pooled analysis of twelve trials put systolic pressure 5.04 mmHg lower with collagen (95% CI -9.22 to -0.85), but with I² of 98.9% the trials disagreed almost completely, so it carries little weight.⁸ A 2010 study randomised 100 Chinese patients with type 2 diabetes and hypertension, all on their regular medicines, to marine collagen peptides or a control for three months and found diastolic pressure lower than in the patient controls; one group's finding, never replicated, with no dose in the abstract.¹²

One trial of 100 patients on their usual medicines measured blood pressure with marine collagen peptides added,¹² but we found none that tested an interaction directly, so the figure that matters is your own reading: the NHS defines high blood pressure as "140/90 or higher when checked by a healthcare professional" or "135/85 or higher when checked at home" (reviewed 19 July 2024).¹³ Collagen has no authorised health claim in Great Britain, a statement about the register, not a verdict on the trials; nothing here is a claim about either.

Which ingredients in a collagen blend carry the cautions?

A plain collagen powder has an ingredient list one line long. The cautions attached to "collagen" online almost always belong to something else in the tub.

Biotin matters if your review includes a thyroid panel; collagen with thyroid medication covers it, as collagen with antidepressants does for that class.

What should you tell your pharmacist?

Three things. Which medicines you take, by name. The product's full ingredient list, one line for a plain powder and a dozen for a blend. And how much you plan to take; the trials used 2.5 to 15 g a day, and how much collagen to take a day gives the ranges.¹⁵ If you suspect a reaction to any supplement, report it through the Yellow Card scheme ("Anyone can report a problem"), which "cannot give you medical advice".¹⁶

When should you speak to a GP?

Whenever something about the medicine changes. The statins page says, "If you think your medicine is causing side effects, talk to a doctor", that some side effects are "rare but serious, and you may need to contact 111 for advice", and, of stopping, "Talk to a doctor or pharmacist before stopping".⁴ A supplement worry is a reason to ask, never to stop or alter a prescribed medicine on your own. Two neighbouring questions have their own pages, written the same way: collagen and your kidneys, since blood pressure medicines often come with kidney monitoring, and collagen with an autoimmune condition.

Frequently asked questions

Can I take collagen with atorvastatin?

None documented; the NHS says "You can eat as normal while taking atorvastatin", and collagen is food. Tell your pharmacist, as the page asks for every supplement.^{1, 5}

Can I take collagen with amlodipine or ramipril?

None documented. The amlodipine page names grapefruit as the food to avoid and nothing else; the ramipril page says supplements "are not tested in the same way as pharmacy and prescription medicines", the reason to tell your pharmacist.^{2, 3}

Does collagen thin the blood?

No trial or case report has shown collagen peptides to affect clotting or the INR. The raised-INR reports with warfarin belong to glucosamine, found in some joint blends.^{1, 11}

Is collagen good for high blood pressure or cholesterol?

Collagen has no authorised health claim in Great Britain, and the trials describe rather than decide (above).^{7, 8} The NHS advice starts with lifestyle, "have a healthy, balanced diet" and "exercise regularly – aim to do at least 150 minutes of exercise a week", with medicine where a GP judges it needed.¹³

Sources

1. NICE. British National Formulary, interactions pages for warfarin, amlodipine, ramipril, atorvastatin, simvastatin and apixaban, fetched 12 October 2026, none containing the word collagen; PubMed interaction searches, 11 October 2026. bnf.nice.org.uk.
2. NHS. Amlodipine: taking it with other medicines, food and drink. Reviewed 9 June 2026. nhs.uk.
3. NHS. Taking ramipril with other medicines and herbal supplements. Reviewed 18 March 2026. nhs.uk.
4. NHS. Statins. Reviewed 5 May 2026. nhs.uk.
5. NHS. Atorvastatin: taking it with other medicines, food and drink. Reviewed 23 June 2026. nhs.uk.
6. NHS. Simvastatin: taking it with other medicines, food and drink. Reviewed 12 May 2026. nhs.uk.
7. Chavez-Alfaro MA, Mensink RP, Joris PJ, Plat J. Effects of porcine-derived collagen hydrolysates on 24 h blood pressure profiles, markers for endothelial dysfunction and low-grade inflammation and the retinal vasculature in adults with overweight/obesity: a randomized, controlled trial. Food & Function, 2025. PubMed 41288414.
8. Jalili Z, Jalili F, Moradi S, et al. Effects of collagen peptide supplementation on cardiovascular markers: a systematic review and meta-analysis of randomised, placebo-controlled trials. British Journal of Nutrition, 2023. PubMed 35658958.
9. NHS. Warfarin: other medicines, food and drink; blood tests. Reviewed 24 February 2026. nhs.uk.
10. NHS. Apixaban: taking it with other medicines, food and drink. Reviewed 21 January 2026. nhs.uk.
11. Knudsen JF, Sokol GH. Potential glucosamine-warfarin interaction resulting in increased international normalized ratio: case report and review of the literature and MedWatch database. Pharmacotherapy, 2008. PubMed 18363538.
12. Zhu CF, Li GZ, Peng HB, et al. Therapeutic effects of marine collagen peptides on Chinese patients with type 2 diabetes mellitus and primary hypertension. American Journal of the Medical Sciences, 2010. PubMed 20739874.
13. NHS. High blood pressure (hypertension). Reviewed 19 July 2024. nhs.uk.
14. Li D, Radulescu A, Shrestha RT, et al. Association of biotin ingestion with performance of hormone and nonhormone assays in healthy adults. JAMA, 2017. PubMed 28973622.
15. 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. PubMed 31096622.
16. GOV.UK. Report a problem with a medicine or medical device (Yellow Card Scheme). gov.uk.

This article is general information, not medical advice. Tell your pharmacist or GP about every supplement you take, including collagen, and talk to them before stopping or changing any medicine.