Collagen Protein vs Whey: Can Collagen Build Muscle?

Collagen protein vs whey comes down to one big difference: whey is a complete protein that is rich in leucine, while collagen is an incomplete protein that is low in leucine and contains no tryptophan. Collagen still counts toward your daily protein, but when studies compare the two head to head, whey supports more muscle building. If muscle is your main goal, pick whey, and think of collagen as an extra rather than a swap.

Collagen protein vs whey at a glance

Leucine figures come from the supplements used in the 2022 study by Jacinto and colleagues described below. Prices are at the time of writing, and cost per serve is based on the serves on each label.

Why collagen is an incomplete protein

Your body needs nine essential amino acids from food. Whey has all nine in good amounts. Collagen is made mostly of glycine, proline and hydroxyproline, and it lacks one essential amino acid, tryptophan, so it is classed as an incomplete protein. It is also low in leucine, the amino acid most closely linked with switching on muscle protein synthesis.

That does not make collagen useless. A 2019 modelling paper worked out that collagen could make up as much as 36% of the protein in a typical Western diet while still meeting essential amino acid needs, because the rest of the diet fills the gap. Keep in mind the authors work for a collagen maker, and the figure assumes you already eat plenty of complete protein such as meat, dairy, eggs or soy.

Can collagen build muscle? What the studies say

Several trials have compared collagen and whey directly. The studies are small, but they point the same way:

• Muscle protein synthesis: In a 2020 trial in 22 older women, 30 g of whey twice a day raised muscle protein synthesis more than the same amount of collagen, both with and without resistance exercise. Over six days, the collagen group's longer-term muscle building was not clearly above baseline.
• Muscle size: In a 10-week training study in 22 untrained young adults, 35 g a day of whey increased thigh and biceps muscle thickness more than collagen, even though extra leucine was added to the collagen to match the whey. Strength gains were similar in both groups.
• Collagen vs nothing: A 2015 study in 53 older men with low muscle mass found 15 g of collagen a day plus training increased fat-free mass more than a placebo. The placebo contained no protein, so this shows collagen is better than no extra protein, not that it matches whey.

The ISSN position stand suggests 20 to 40 g of high-quality protein per serve, with about 700 to 3,000 mg of leucine, and 1.4 to 2.0 g of protein per kg of body weight a day for most people who train. A whey isolate hits those marks in one scoop. Collagen does not, unless it is mixed with other proteins.

When collagen protein still makes sense

Collagen can still earn a place in your routine, as long as it is not your only protein:

• A light, juice-style protein drink. Cyborg Collagen Pro Protein Water gives 25 g of protein per serve with 0 g fat and 0 g carbs on the Sunset Fruits panel, and mixes with cold water into a clear-style drink rather than a creamy shake. Count it toward your daily total, but get your complete protein from meals or whey.
• Whey and collagen in one scoop. Cyborg WPI + Collagen Booster lists whey protein isolate first, then bovine collagen, for 25 g of protein per 30.7 g scoop at $119.95 for 1 kg. Because whey is the main ingredient, it behaves much more like a whey shake. The label does not list the collagen amount separately.
• A separate daily collagen. If you take collagen for its own reasons, R1 Collagen Peptides gives 10 g of hydrolysed bovine collagen per scoop with added vitamin C and hyaluronic acid, at $54.95 for 25 serves. It sits alongside your protein shake, not in place of it. Our collagen types guide explains the different kinds.

How to fit both into your day

Here is a simple example for someone who trains and wants to keep collagen in the mix. It is a guide, not a meal plan, so adjust the amounts to your own protein target.

• Breakfast: eggs, Greek yoghurt or another complete protein food.
• After training: one scoop of a whey isolate, about 25 g of protein.
• Afternoon: a collagen protein water or your usual collagen scoop, counted toward your daily total.
• Dinner: a palm-sized serve of meat, fish, tofu or legumes.

The key is that most of your protein comes from complete sources, so the collagen adds to your day without leaving you short on leucine or tryptophan. If you are not sure how much protein you need, start with the ISSN range above and adjust with your coach or dietitian.

Which should you choose?

If building muscle is the goal, choose a whey protein isolate. R1 Protein WPI is our best-selling protein powder listing over the last six months and gives 25 g of protein per scoop with all the essential amino acids. The 5 lb tub works out to about $3.52 per serve at the time of writing.

Choose WPI + Collagen Booster if you want whey and collagen in one product. Choose Collagen Pro Protein Water if you want a light protein drink on top of a diet that already has plenty of complete protein. Compare more options in our best whey protein isolate guide and our best collagen supplement guide, or browse the full collagen range in Australia at Supps247.

How our price compares

Here is what the same products cost at other Australian supplement stores, so you can check the difference yourself.

Supps247 prices come from our website. Other prices were checked on the websites of Nutrition Warehouse, Australian Sports Nutrition (ASN), Elite Supps and Supplement Mart on 29 October 2026 (same product and size, price for one unit) and can change at any time. Sale means it was on sale that day. Not listed means we could not find that exact product on their site. Other sizes only means they sell it in a different size. Supps247 members can use our Price Match Guarantee against Nutrition Warehouse, ASN, Elite Supps and Supplement Mart: we beat their full price by 5% or match their sale price (conditions apply).

Shop the products in this guide

R1 Protein WPI 5 lb$249.95Cyborg WPI + Collagen Booster 1 kg$119.95Cyborg Collagen Pro Protein Water 1 kg$89.95R1 Collagen Peptides Unflavoured$54.95

Browse all collagen and whey protein isolates.

FAQs

Can collagen replace whey protein for building muscle?

Not well. Collagen has no tryptophan and much less leucine than whey, and head-to-head studies found whey raised muscle protein synthesis and muscle size more than collagen, even when extra leucine was added to the collagen. If muscle is your goal, use whey or another complete protein as your main shake and use collagen as an extra.

Is collagen a complete protein?

No. Collagen lacks tryptophan, one of the nine essential amino acids, so it is classed as an incomplete protein. It is also low in leucine. It still provides protein and counts toward your daily total, especially if the rest of your diet includes complete proteins such as meat, fish, eggs, dairy or soy.

Can I take collagen and whey protein together?

Yes. Many people have a whey shake for muscle and a separate collagen supplement for their own reasons, or use a combined product such as Cyborg WPI + Collagen Booster, which lists whey protein isolate first and then collagen. Count both toward your daily protein and follow the directions on each label.

Does collagen protein count toward my daily protein intake?

Yes, collagen counts as protein on the label and in your daily total. Because it is incomplete, it works best when the rest of your diet has plenty of complete protein. One modelling paper estimated collagen could make up as much as 36% of daily protein in a typical Western diet while still meeting essential amino acid needs.

How much protein do I need to build muscle?

The ISSN suggests 1.4 to 2.0 g of protein per kg of body weight a day for most people who train, spread over meals of about 20 to 40 g of high-quality protein. For a 75 kg person that is about 105 to 150 g a day. A whey isolate scoop with about 25 g of protein is an easy way to top up.

Sources: Oikawa et al. 2020, whey vs collagen and muscle protein synthesis in older women (AJCN); Jacinto et al. 2022, whey vs leucine-matched collagen and muscle thickness (IJSNEM); Paul, Leser and Oesser 2019, collagen and amino acid balance (Nutrients); Zdzieblik et al. 2015, collagen and resistance training in older men (BJN); ISSN position stand: protein and exercise (2017); product labels and brand nutrition panels, checked October 2026.

Order online with Australia-wide delivery, free on orders of $99.99 or more, with Afterpay available at checkout. You can also use click and collect at a store that offers it, or visit a Supps247 store in Melbourne, regional Victoria or Brisbane to compare products in person. Members can use our member price match on full-priced items.

Prices and stock were checked on 29 October 2026 and can change at any time. Always read the label and follow the directions for use. If you have a medical condition, are pregnant or take regular medication, check with your doctor first.