If you’re already taking one type of collagen and wondering whether adding another to the mix is a good idea, or a recipe for wasted money, you’re asking the right question.

The short answer? Yes, you absolutely can take bovine and marine collagen together. And there are actually some pretty compelling reasons why you might want to.

Let’s break down why combining these two collagen sources could give your body a broader spectrum of benefits, how the science stacks up, and how to do it without overdoing things.

They’re Not Identical (And That’s the Point)

Bovine and marine collagen come from different sources — cow hides and fish skin or scales respectively — and while they share a lot of common ground, they’re not carbon copies of each other.

Bovine collagen is rich in both Type I and Type III collagen. Type I is the most abundant collagen in your body, responsible for skin structure, bone strength, and tendon integrity. Type III plays a supporting role in your muscles, arteries, organs, and — crucially — your gut lining. Both types are found in the intestinal wall, which is why bovine collagen has become a go-to for people focused on gut health, joint support, and overall structural repair.

Marine collagen, on the other hand, is almost exclusively Type I collagen. Where it shines is bioavailability — the peptides tend to be smaller in molecular size, which means your body can absorb them more efficiently. Some estimates suggest marine collagen is absorbed up to 1.5 times more effectively than bovine collagen, largely due to those smaller peptide molecules. It’s long been a favourite in the beauty industry for its impact on skin elasticity, hydration, and reducing the appearance of fine lines.

So when you take both together, you’re not doubling up on the same thing. You’re broadening the range of collagen types and amino acids your body has access to — getting the structural depth of bovine alongside the faster absorption of marine.

The Amino Acid Angle

Both bovine and marine collagen deliver the key amino acids your body needs for collagen synthesis — glycine, proline, and hydroxyproline. These three make up a significant proportion of collagen’s structure and are essential for maintaining healthy skin, cartilage, and connective tissue. But the ratios differ between the two sources, and that’s where the combination becomes interesting.

Bovine collagen tends to be higher in glycine and hydroxyproline, which are important for skin repair, muscle tissue maintenance, and even brain function. Glycine alone accounts for roughly a third of collagen’s amino acid composition and plays a vital role in everything from sleep quality to inflammation regulation. Research published in the journal Amino Acids found that glycine is essential for collagen synthesis in cartilage, and that higher concentrations significantly increased Type II collagen production in chondrocytes — the cells responsible for maintaining healthy cartilage.

Marine collagen contains more alanine, which supports immune function and recovery. Its amino acid profile is also thought to closely resemble that of human collagen, which may contribute to its efficiency once absorbed.

By combining the two, you’re essentially giving your body a more complete amino acid toolkit. Think of it like eating a varied diet rather than the same meal every day — more variety means more bases covered.

What Does the Research Say?

While there aren’t yet clinical trials specifically testing bovine and marine collagen taken simultaneously, there’s strong evidence supporting the benefits of each individually — and the logic of combining them holds up well.

A large-scale systematic review and meta-analysis published in Nutrients analysed 26 randomised controlled trials involving 1,721 participants and found that hydrolysed collagen supplementation significantly improved both skin hydration and elasticity compared to placebo groups. The review noted that these benefits were consistent regardless of whether the collagen source was bovine or marine.

On the joint health side, a systematic review published in Amino Acids examined the effects of collagen peptide supplementation on body composition, collagen synthesis, and recovery from joint injury. The review found that 5 to 15 grams per day of collagen peptides — taken consistently for at least 12 weeks — was associated with reduced joint pain during activity, improved connective tissue repair, and enhanced recovery in athletes. The researchers noted that collagen peptides appear to stimulate the synthesis of Type I, II, and IV collagen in articular cartilage, potentially reducing tissue damage over time.

And for gut health, one of the key reasons people reach for bovine collagen specifically, a study published in Food & Function demonstrated that collagen peptides helped strengthen the intestinal barrier by enhancing tight junctions in gut epithelial cells. This is significant because compromised tight junctions are a hallmark of increased intestinal permeability, often referred to as “leaky gut”.

Taken together, this body of evidence supports the idea that using both collagen sources gives your body a wider range of building blocks for skin, joints, and gut repair simultaneously.

Who Benefits Most From Combining Both?

Not everyone needs to take both, but there are some scenarios where it makes particular sense.

You want skin benefits AND joint support. Marine collagen’s superior bioavailability makes it excellent for skin health, while bovine collagen’s Type III content gives you that extra joint, gut, and connective tissue support. Together, they cover more ground than either one alone.

You’re over 30 and collagen production is declining. From around age 25 to 30, your body’s natural collagen production drops by roughly 1 to 1.5% per year. By the time you reach your mid-forties, you may have lost a quarter of your collagen stores. Supplementing with both sources gives your body more raw materials to work with as it tries to keep up with demand.

You’re active or recovering from injury. Athletes and gym-goers can benefit from bovine collagen’s support for muscles, tendons, and ligaments, combined with marine collagen’s faster absorption for quicker delivery of those recovery-boosting amino acids. Research suggests that collagen peptides taken alongside exercise may be particularly effective for connective tissue repair and reducing activity-related joint pain.

You’re dealing with gut issues. If digestive health is a priority — whether that’s bloating, food sensitivities, or suspected leaky gut — bovine collagen’s Type III content and its high glycine levels make it especially relevant. Adding marine collagen alongside gives you additional Type I support for the intestinal lining itself.

You just want to cover all your bases. If you’re supplementing collagen for general wellness and anti-ageing, using both types is a straightforward way to ensure you’re not missing out on any potential benefits.

How to Take Them Together

There’s nothing complicated about combining the two. You can take them at the same time — mixed into the same drink if you like — or split them throughout the day. Some people prefer bovine collagen in their morning coffee and marine collagen in a smoothie later on. It really doesn’t matter.

The key thing to watch is your total daily intake. Most research suggests that 5 to 15 grams per day is the sweet spot for collagen supplementation. If you’re taking both types, make sure your combined dose falls within that range rather than taking a full dose of each. Going above 20 grams daily isn’t dangerous, but it’s unlikely to deliver extra benefits and could cause mild digestive discomfort in some people.

One tip worth highlighting: pair your collagen with vitamin C. It acts as an enzymatic cofactor in collagen synthesis, which means it directly helps your body convert the amino acids you’re consuming into usable collagen. A glass of orange juice, some berries, or even a vitamin C supplement alongside your collagen can make a genuine difference to how effectively your body puts it to work.

How Long Before You See Results?

Patience matters here. Collagen isn’t a quick fix — it builds up gradually in your system over weeks and months of consistent use.

Most people begin to notice skin improvements like better hydration and elasticity within 4 to 6 weeks. The Nutrients meta-analysis mentioned above found statistically significant skin benefits across studies lasting 8 to 12 weeks, though some individual trials reported noticeable changes as early as 4 weeks.

Joint and recovery benefits typically take longer — expect 8 to 12 weeks minimum, with some studies showing continued improvement up to 24 weeks. This makes sense when you consider that cartilage and connective tissue turn over much more slowly than skin cells.

Gut health improvements are harder to pin down with a specific timeline, as they depend heavily on individual circumstances. However, the amino acids in collagen — particularly glycine, glutamine, and proline — begin supporting intestinal repair from the point of consistent daily supplementation.

The takeaway? Stick with it. Daily consistency matters far more than the exact time of day you take it or whether you split your doses.

Are There Any Downsides?

Honestly, not really. The main considerations are practical rather than safety-related.

Cost. Running two collagen supplements simultaneously will obviously cost more than sticking with one. If budget is a concern, bovine collagen gives you the broadest collagen type coverage (Types I and III) at a generally lower price point than marine collagen.

Allergies. If you have a fish or shellfish allergy, marine collagen is off the table entirely — stick with bovine. Bovine collagen is free from the top 14 major allergens, making it the safer option for anyone with dietary sensitivities. Conversely, if you’re pescatarian or avoid beef for dietary or religious reasons, marine collagen is your best bet.

Taste. Quality marine collagen should be virtually tasteless once the fish oils are removed during processing, but cheaper products can carry a slight fishy note. Bovine collagen is generally more neutral in flavour. If you’re mixing both into the same drink, it’s worth investing in reputable brands to keep things palatable.

Quality variation. Not all collagen supplements are created equal. Look for hydrolysed collagen peptides with a molecular weight around 5,000 daltons — this is considered the optimal size for absorption. Grass-fed bovine and sustainably sourced marine collagen from reputable UK brands will give you the best results. Avoid products bulked out with fillers, artificial sweeteners, or unnecessary additives.

The Bottom Line

Taking bovine and marine collagen together is perfectly safe and can actually be a smart strategy for getting the most out of your collagen supplementation. Bovine brings the Type I and III combination along with a strong amino acid profile for joints, gut, and structural support. Marine brings superior absorption and a proven track record for skin health.

Combined, they give your body a broader range of collagen types and amino acids than either source alone — which is exactly what you want when you’re trying to support everything from your skin to your joints to your gut. The research consistently supports collagen supplementation for these purposes, and combining sources is a logical way to maximise the benefits.

Just keep your total daily intake sensible (5–15g combined), pair it with vitamin C, choose quality products from reputable brands, and give it at least 8 to 12 weeks of consistent daily use. Your body will thank you for it.

Medical Disclaimer – The information provided on this page is for general informational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your GP or other qualified health provider with any questions you may have regarding a medical condition or before starting any new supplement. Never disregard professional medical advice or delay in seeking it because of something you have read on this website. Individual results may vary.