Marine vs Bovine Collagen: What's the Actual Difference?

Collagen is the most abundant protein in your body. It's the structural scaffolding for your skin, hair, nails, joints, and connective tissue. Your body makes it naturally, but production starts to slow from your mid-20s onwards.

Topping it up through diet or supplements gives your body the amino acid building blocks (mainly glycine, proline and hydroxyproline) it uses to keep making its own collagen.

Marine collagen is sourced from fish, usually the skin and scales. It's almost always Type I collagen, which is the dominant type in skin, hair and nails.

The standout feature: marine collagen tends to have a smaller molecular size after hydrolysis, which some research suggests means it's absorbed efficiently. It's the form that turns up in a lot of premium beauty-focused supplements for that reason.

The trade-off: it's not vegan or vegetarian, and it's a fish allergen, so it's not suitable if you've got a seafood allergy.

Bovine collagen is sourced from cattle (usually hides). It's typically a mix of Type I and Type III, the latter being more associated with joint and gut support.

Bovine peptides are usually a bit larger than marine, but still absorbed well. They're often cheaper, often unflavoured, and are the form you'll see in big tubs of powder.

If your priorities are joints, gut lining and a more budget-friendly daily ritual, bovine is a reasonable pick.

For hair, skin and nails specifically, marine collagen is the form most beauty-first supplements reach for. It's dominantly Type I (the skin one), efficiently absorbed, and it's the one with the most-talked-about results.

That's exactly why our Advanced Hair, Skin & Nail Gummies use 200mg of marine collagen peptides per serve, paired with 5mg biotin, 50mg hydrolyzed keratin, 200mg MSM, and 2400mcg Vitamin A (retinol). It's a full glow stack, not just collagen.

Heads up: because they use marine collagen and keratin, our Beauty Gummies are the one Flexies formula that isn't vegan. If you want a vegan glow ritual, our Sea Moss Gummies are a great alternative.

Skin first (around 2 to 4 weeks), nails next (4 to 8 weeks), hair last (8 to 12 weeks and beyond, because hair grows about a centimetre a month).

Two non-negotiables that make collagen actually land: take it daily, and wear SPF. UV breaks collagen down faster than you can build it.