Marine collagen is one of the most studied beauty actives on the supplement shelf. And yet, more and more specifications open with the same line: “fish-free”. That is not a rejection of the ingredient. More often than not, it comes down to an allergen, a diet or a format.
There are four main alternatives to marine collagen today: bovine or porcine collagen, type II collagen from poultry, so-called “vegan collagen” formulas, which contain no collagen, and eggshell membrane, a matrix naturally rich in collagen. The right choice depends on why you are moving away from fish: an allergen to avoid, a vegetarian target, or a gram-level dose that will not fit into your capsule or your gummy.
Why look for a fish-free collagen?
The allergen and the diet
Fish is one of the 14 allergens listed in Annex II of Regulation (EU) No 1169/2011. The exemptions are narrow: fish gelatin used as a carrier for vitamin or carotenoid preparations, and fish gelatin or isinglass used as a fining agent in beer and wine. Marine collagen used as an active must therefore be declared and emphasized in the ingredient list. Then comes the question of diet: marine collagen suits pescatarians, not vegetarians. For an ovo-vegetarian range, you need to look elsewhere.
The dose, which decides the format
Skin trials test hydrolyzed collagen, from any source, at doses of one gram or several grams. One trial in 69 women, for example, used 2.5 g or 5 g of collagen peptides per day for 8 weeks, with improved skin elasticity versus placebo in both groups (Proksch et al., 2014). Some studies go lower: a low-molecular-weight fish collagen peptide, tested at 1 g per day in 64 people for 12 weeks, improved hydration, wrinkles and two of three elasticity parameters versus placebo (Kim et al., 2018). Even at 1 g, that means two capsules. In a stick pack, no problem. In a gummy, it is a different story.
The odor, to check on a sample
The skins of oily fish contain lipids that oxidize during processing and can leave a fishy note in the powder. Appropriate defatting can make it negligible (Nilsuwan et al., 2021): it is a point to assess on a sample, not a systematic defect.
What do the studies say about marine collagen and skin?
Marine collagen keeps real strengths. It makes use of by-products from fish processing, such as skins and scales, and it has an extensive body of clinical literature. A meta-analysis of 26 randomized trials, pooling 1,721 participants, concludes that hydrolyzed collagen improves skin hydration and elasticity versus placebo. The source of the collagen influenced the results on hydration, but not on elasticity (Pu et al., 2023).
Let's be honest: the debate is not settled. Another meta-analysis, covering 23 trials and 1,474 participants, finds an overall effect on hydration, elasticity and wrinkles, but that effect disappears when only trials not funded by industry, or those of higher methodological quality, are kept (Myung and Park, 2025). This caveat applies to every beauty ingredient presented here, whose trials are often small and linked to the supplier.
Which fish-free options can replace marine collagen?
Bovine or porcine collagen: the same logic, without the allergen
This is the most direct replacement: hydrolysates of the same nature, rich in type I collagen, used at the same gram-level doses, with no major allergen. They solve neither the format nor the diet: no vegetarian compatibility, and porcine is excluded from halal or kosher ranges. If your only constraint is the fish allergen and you are working on a powder, this is probably the simplest solution.
Poultry type II collagen: two very different ingredients
Undenatured type II collagen, sourced from chicken sternum, is dosed at 40 mg per day, but its trials focus mainly on joints (see our comparison of joint supplement ingredients), with little on skin.
Hydrolyzed chicken sternal cartilage extract, for its part, combines hydrolyzed type II collagen, chondroitin and hyaluronic acid. In a 12-week trial in 128 women aged 39 to 59, 1 g per day (two 500 mg doses) reduced wrinkles and fine lines and increased skin elasticity versus placebo in the 113 participants who completed the study, with no difference in skin water content (Schwartz et al., 2019).
“Vegan collagen”: useful, as long as you call it by its name
Collagen exists only in the animal kingdom. Products sold as “vegan collagen” generally combine amino acids found in collagen (glycine, proline, lysine), vitamin C and sometimes plant extracts. They contain no collagen, and must not be presented as collagen. Their strength lies elsewhere: they suit a vegan target and can rely on the authorized vitamin C claim, “Vitamin C contributes to normal collagen formation for the normal function of skin”. We have devoted a full article to this subject: vegetarian collagen, myth and reality. As for collagens produced by precision fermentation, they fall in principle under Regulation (EU) 2015/2283 on novel foods, a point to check before any project.
Eggshell membrane: a collagen matrix at a capsule-sized dose
Eggshell membrane naturally contains collagen, elastin, hyaluronic acid, glucosamine and chondroitin. What sets it apart for a beauty formula is the dose: skin trials have tested it at 300 to 450 mg per day, which is a single capsule. Two randomized placebo-controlled trials, each conducted on a different eggshell membrane:
- Fresh, mechanically separated eggshell membrane, 300 mg per day, 62 women aged 40 to 70, 8 weeks: skin firmness and elasticity improved at day 57 versus placebo and versus a hydrolyzed bovine collagen dosed at 8 g per day, with lower transepidermal water loss than under placebo. Hydration and wrinkles did not differ significantly. (González-Rodríguez et al., 2026).
- Hydrolyzed eggshell membrane, 450 mg per day, 88 middle-aged adults, 12 weeks: appearance of crow's feet improved from 4 weeks and skin tone at 8 weeks, effects on hair thickness and breakage, no effect observed on nails (Kalman and Hewlings, 2020).
Two trials on two different membranes is not much: encouraging signals, not a demonstration, and neither was conducted on Reggenerate®. Eggshell membrane is not vegan, and egg is an allergen that must be declared. But for a fish-free, ovo-vegetarian range, it is one of the few compatible collagen sources.
Marine collagen alternatives compared
| Option | Daily dose studied (skin) | Realistic formats | Allergen to declare | Compatible diets | Contains collagen? |
|---|---|---|---|---|---|
| Marine collagen (reference) | 1 g to several grams | Powder, stick pack, drink | Fish | Pescatarian, omnivore | Yes, mostly type I |
| Bovine or porcine collagen | Several grams | Powder, stick pack, drink | None of the 14 | Omnivore (porcine excluded for halal and kosher) | Yes, mostly type I |
| Undenatured type II collagen (poultry) | 40 mg, mostly joint trials | Capsule, tablet | None of the 14 | Omnivore | Yes, type II |
| Hydrolyzed chicken sternal cartilage | 1 g | Two capsules | None of the 14 | Omnivore | Yes, type II, with chondroitin and hyaluronic acid |
| “Vegan collagen” | Varies with the formula | Capsule, powder | Depends on the formula | Vegan | No |
| Eggshell membrane (including Reggenerate®, native eggshell membrane) | 300 to 450 mg | One capsule, tablet, gummy, powder, bar | Egg | Ovo-vegetarian, omnivore | Yes, with elastin and hyaluronic acid |
How do you choose based on your specifications?
Marine collagen remains relevant if your format is a powder or a drink and your target is neither vegetarian nor allergic to fish. Nothing justifies replacing it as a matter of principle. If your only constraint is the allergen, a bovine or porcine collagen does the same job. If you are targeting vegans, a blend of amino acids and vitamin C is the only route, without presenting it as collagen.
For a gummy or a small capsule, on the other hand, we strongly advise against hydrolyzed collagen, whatever its source: at a few hundred milligrams per unit, you will be far from the doses studied, and an informed buyer will notice. A low-dose active matrix, such as eggshell membrane, is made for these formats. Nothing stops you from combining either: 300 mg of eggshell membrane in a bovine collagen stick pack brings elastin and hyaluronic acid without weighing down the formula.
On the label, neither collagen nor eggshell membrane has an authorized health claim in Europe. The skin message therefore relies on nutrients whose claims are authorized under Regulation (EC) No 1924/2006, such as vitamin C, biotin or zinc, in the exact wording of the EU register of claims.
Why we chose a native membrane at 300 mg
At Circul'Egg, we chose to keep the membrane in its native, non-hydrolyzed form, separated from the shell by a 100% mechanical, solvent-free process. It retains its original matrix, including type I, V and X collagen. We recommend it at 300 mg per day, a dose that fits into a capsule as easily as into a gummy.
Reggenerate®, native eggshell membrane, is developed by Circul'Egg, a company based in Janzé, Brittany, from upcycled eggshells, with ISO and HACCP certifications. To launch a fish-free beauty formula quickly, our ready-to-market range starts from this same base. I remain convinced: the best substitute for marine collagen is not the one that looks most like it, it is the one that delivers the studied dose in the format your customer will actually take.
Frequently asked questions
Is marine collagen more effective than bovine collagen for skin?
The data do not allow a clear-cut answer. In the meta-analysis of 26 trials published in 2023, the source of the collagen influenced the results on hydration, but not on elasticity. The choice therefore comes down mainly to the allergen and the target diet.
Does a “vegan collagen” contain collagen?
No. Collagen is a protein of animal origin. These products generally combine amino acids, vitamin C and plant extracts. They can rely on the authorized vitamin C claim, without being presented as a source of collagen.
Can eggshell membrane replace marine collagen in a gummy?
It is one of the formats where it makes the most sense, since skin trials have tested it at 300 to 450 mg per day. You do, however, need to declare the egg allergen, and keep in mind that these trials, still few in number, were conducted on membranes other than Reggenerate®.