Do Collagen Supplements Interact with Medications?
Do collagen supplements interact with medications?
Herbal remedies, vitamins and minerals can be excellent for your overall health. But they can sometimes be dangerous for people on medications. One example of this is garlic supplements interacting with anticoagulants. These medications are often taken by people at high risk of heart attack or stroke. The interaction can increase the risk of excessive bleeding. But do collagen supplements interact with medications?
What is in collagen supplements?
To understand the potential for collagen to interact with medications, it helps to know what is actually in your supplement. Drug interactions generally take place on a compound-to-compound basis.
Marine collagen supplements like Kollo contain hydrolysed collagen peptides derived from fish. Collagen is a protein, so it consists of amino acids — the same building blocks found in the protein content of food. However, supplementing with a concentrated collagen product means you are consuming a significant amount of protein in a single serving, which is different from the gradual protein intake across a normal meal.
This means that when asking whether collagen supplements interact with medications, you are in part asking about the effects of a high-protein intake on certain drugs. Generally speaking, high-protein diets are very safe. But as with everything, there are exceptions worth knowing about.
Collagen and blood pressure medication
Can you take collagen with high blood pressure medication? There is some evidence that a high-protein diet could affect certain blood pressure medications:
- Warfarin: Some studies indicate a high-protein, low-carbohydrate diet might decrease the effectiveness of warfarin. If you are taking warfarin, consult your GP before adding any new supplement to your routine.
- Propranolol: A 1986 study found that the removal rate of propranolol from the body increases with high-protein intake, potentially reducing the drug's effectiveness. There is no specific test involving collagen, but this is worth discussing with your doctor.
There is no direct clinical evidence linking collagen supplementation specifically to negative interactions with blood pressure medications. But the caution around high-protein intake and these drugs makes a conversation with your GP advisable before starting.
Is collagen a blood thinner?
No, collagen actually supports blood clotting rather than thinning the blood. However, if you are on blood thinners, always check with your doctor before starting any new supplement. Some lower-quality collagen products may contain trace contaminants from poor sourcing practices, which is why choosing a high-quality, certified product matters. Kollo uses Naticol® marine collagen from sustainably certified fisheries, produced through clean enzymatic hydrolysis and tested for over 250 potentially harmful substances under Informed Choice certification.
Collagen and thyroid medication
Thyroid disease is very prevalent and many people take daily medication such as levothyroxine for hypothyroidism, or thionamides for hyperthyroidism. Currently, there is no evidence of negative interactions between collagen supplementation and thyroid medications. High-protein diets are not known to interfere with thyroid medication absorption or efficacy, so collagen supplementation should generally be safe for people on thyroid medications.
That said, levothyroxine is a medication where timing matters considerably. It is typically taken on an empty stomach, away from other supplements and foods. If you take levothyroxine, space your collagen supplement at least 30 to 60 minutes away from your thyroid medication to avoid any potential absorption interference.
What about the other ingredients in collagen supplements?
It is worth remembering that many collagen supplements contain more than just hydrolysed collagen. Kollo, for example, includes Vitamin C and a full B vitamin complex alongside the collagen peptides. These additional nutrients are generally very safe and well tolerated, but they are worth mentioning to your GP when discussing your supplement routine, particularly if you are on medication that interacts with specific vitamins.
What can we conclude?
The honest answer is that while there is very little evidence of collagen supplements causing serious medication interactions, there are some specific situations where caution is appropriate. The best advice is always to consult your healthcare provider before starting any supplement if you are on regular medication. Your doctor can consider your full medical history and the specific medications you take.
For more information about collagen safety and quality, read our complete guide to collagen safety. And for a full picture of how collagen fits into a daily wellness routine, our complete guide to liquid marine collagen covers everything you need to know about dosing, benefits and what to look for in a supplement.
Women navigating perimenopause or menopause who are considering adding collagen alongside other supplements can read our complete guide to menopause supplements and our guide to the best supplements for women over 40 for a comprehensive overview.
Is Kollo a trustworthy brand?
Kollo uses Naticol® marine collagen — a patented ingredient with a fully traceable supply chain, sourced from sustainably certified fisheries and produced through clean enzymatic hydrolysis. Every batch is Informed Choice certified, independently tested for over 250 potentially harmful substances before release.
Kollo is committed to transparency at every stage. Full ingredient details, clinical study references and thousands of verified customer reviews are available on the website. If you have questions about whether Kollo is right for you alongside your current medications, our team can be reached through the Contact page.
