Beauty writer Jocelyn Bailey explains peptides in skincare, how they differ from oral collagen supplements, and what to look for when choosing products for your skin.
🕒 9 min read
What are collagen peptides?
Collagen peptides are short chains of amino acids made by breaking down collagen, a structural protein in skin and other connective tissues. In supplements, this broken-down form is usually called hydrolysed collagen. Peptides in a skincare serum may be different ingredients, designed for use on the skin rather than taken by mouth.1
If you like a bit of technical detail, peptides are essentially tiny constituents of protein; short chains of amino acids that are linked by peptide bonds and form the building blocks of skin proteins such as collagen, elastin and keratin.
Collagen helps give skin its structure, elastin is its stretchy component and keratin helps form its protective outer layer. In order to keep your complexion supple and smooth, your body needs a supply of amino acids. Collagen changes as we age, which is one reason peptides attract so much interest.
Natural peptides are produced in the body. Protein foods, including meat, fish, eggs, dairy, wholegrains, legumes and soy, also supply amino acids as they are digested. There are hundreds of different peptides involved in countless processes in the body; not all have the same role or the same evidence behind them.
But since not all peptides are the same, which type best suits your skin and where can you find them? You can compare oral options in our collagen supplements range, or read our guide to what collagen does in the body.
What are the benefits of collagen peptides for skin?
Oral collagen research has mainly explored skin hydration, elasticity and the appearance of wrinkles. Some trials and pooled reviews report improvements, making these useful areas to understand when comparing supplements. The size and reliability of the benefit vary with the product and study design.2, 3
| Area of interest | What studies explore | What to compare |
|---|---|---|
| Hydration | Changes in the skin's moisture levels following regular oral supplementation. | The exact formulation, daily serving and length of the trial. |
| Elasticity | How readily skin returns to its shape after being stretched. | Measured changes rather than a general promise of firmer skin. |
| Fine lines and wrinkles | Changes in wrinkle measurements or appearance with specific products. | Whether results come from controlled trials or customer impressions. |
| Nutritional support | Added vitamin C supports normal collagen formation for normal skin function. | The amounts of added nutrients and overlap with other supplements. |
A 2023 review of 26 trials reported improved hydration and elasticity. A 2025 review also found benefits when studies were pooled, but these were not demonstrated in the studies without pharmaceutical-company funding. That makes the evidence promising but uncertain, rather than proof that every collagen supplement will deliver the same result.2, 3
Vitamin C's contribution to normal collagen formation is an established nutritional role, distinct from the research into taking collagen peptides themselves. Biotin and zinc also contribute to maintaining normal skin.4
Platinum Marine Collagen Skin Complex
A day-and-night supplement combining collagen peptides, vitamins and a skin oil blend.
- Hydrolysed fish collagen peptides
- Vitamin C supports normal collagen formation for normal skin function
- Biotin and zinc help maintain normal skin
How much collagen should you take for skin?
There is no single established daily dose of collagen peptides for skin. Studies use different sources, peptide preparations and amounts. One trial used 2.5g or 5g daily for eight weeks and found improved elasticity; changes in skin moisture were not statistically significant compared with placebo. Those results relate to the specific preparation tested.5
For everyday use, follow the directions on your chosen product. Check the collagen amount per daily serving, rather than assuming that all collagen tablets or powders provide the same amount. For example, Super Strength Marine Collagen Complex provides 1,000mg of collagen per tablet and its directions are one tablet daily.
Platinum Marine Collagen Skin Complex is a combination formula: its daily directions are one tablet in the morning and one capsule in the evening. Its tablet provides 250mg of collagen peptides alongside vitamins and minerals; the capsule provides a blend of oils. Its formulation is different from the gram-dose preparations used in the trial above.
Choose a routine you can follow consistently. Do not increase the labelled dose to copy a study, and check the source and allergens, particularly if you have a fish allergy. Ask your pharmacist or healthcare professional about suitability if you take medicines, have a medical condition, or are pregnant or breastfeeding.
Collagen for skin: an expert perspective
In her collagen-for-skin guide, Aesthetic Nurse Practitioner Julie Brackenbury highlights three practical checks when choosing supplements: the collagen source, whether it is hydrolysed, and whether the formula includes vitamin C.
Type I collagen is a major structural component of skin, tendons and bones. Type II is associated with cartilage, while type III occurs in skin and other tissues. A product's collagen type helps explain its ingredients, but does not establish which supplement will work best for an individual.1
Her guide also stresses looking after the collagen you already have. Alongside a varied diet, make sun protection and avoiding smoking part of your skin routine. Supplements and skincare work within that wider routine; neither replaces it. For daytime protection, choose a broad-spectrum sunscreen with SPF 30 or higher.6
Peptides for skin: understanding the different types
In skincare, each type of peptide has its own intended action. Since there are so many different kinds, it helps to understand three of the main groups. How well an ingredient works also depends on its concentration, the finished formula and whether it can reach its intended target.7
Signal peptides
This is the communications group. They're basically messengers, studied for their ability to influence processes such as collagen and elastin production. In skincare, the aim is to improve the appearance of firmness, elasticity and fine lines.
Carrier peptides
These help carry trace elements to where they are needed. Copper peptides are one example: copper is involved in processes associated with connective tissue and skin repair.
Neuropeptides
Also known as neurotransmitter-inhibiting peptides, these are studied for effects on signalling involved in expression lines. A cosmetic serum is different from an injectable treatment, and the evidence for individual peptide ingredients should not be treated as proof for every finished product.
Peptides in skincare and supplements: what's the difference?
There's more than one way to deploy peptides – from supplements as tablets or capsules to topical serums. Oral collagen is digested after you swallow it; a serum is applied directly to the skin. They are different approaches, so the results from one cannot simply be applied to the other.
Peptides can be combined with other ingredients, whether it's another kind of peptide, antioxidants, hyaluronic acid for hydration or niacinamide. Depending on your skin's needs, there may be a combination that suits it.
The Platinum Marine Collagen Skin Complex supplement contains hydrolysed fish collagen peptides, vitamins and minerals, with a separate oil capsule. You will also find collagen peptides in Super Strength Marine Collagen Complex, which contains type I fish collagen and type II chicken collagen, with added vitamin C and copper.
Choosing a peptide serum
Part of Healthspan's skincare range, Replenish Collagen Boosting Serum is a lightweight formula designed to be used under moisturiser. Its current ingredient list includes palmitoyl tripeptide-1 and palmitoyl tetrapeptide-7, alongside soy extract and moisturising ingredients. It is designed to improve hydration and the appearance of fine lines for a smoother-looking complexion.
Replenish Collagen Boosting Serum
A lightweight serum for a smoother, more radiant-looking complexion.
- With palmitoyl tripeptide-1 and palmitoyl tetrapeptide-7
- Helps improve hydration and the appearance of fine lines
- Apply to cleansed face and neck before moisturiser
Perfect pairings for your peptides
Retinol
Retinoids are vitamin A derivatives, and are well known in skincare for fine lines, uneven pigmentation and texture. Although retinol and peptides may appear in routines with similar goals, they're not the same ingredients.
Retinoids can irritate, so introduce them gradually and use a moisturiser. Use retinol at night and protect your skin from the sun during the day. Retinoids should not be used during pregnancy.8
Ceramides
Another possible partner is ceramides, particularly for dry or fragile skin. These lipids help support the skin barrier and reduce moisture loss. A moisturiser can be a useful companion to a serum when your skin feels dry.9
When less is more
Some peptides are used in small quantities, so you may find them near the end of a product's ingredients list. This alone does not tell you how effective the finished formula will be.
Serums tend to have lighter textures than creams. Apply your peptide product after cleansing and before your usual moisturiser, following its directions. Give it time to absorb before layering other products, and introduce new skincare gradually to see how your skin responds.
Want a few more details?
Look at the ingredients list on a beauty product and a peptide's name may indicate the number of amino acids in its chain. For example, tripeptide indicates three, tetrapeptide four, pentapeptide five and hexapeptide six. Some peptide blends also have trade names.
Smaller molecules are not automatically guaranteed to penetrate deeply into skin. Delivery depends on the molecule and the formulation, which is why research on a specific finished product is useful.7
Collagen peptides FAQs
Are collagen peptides the same as collagen?
They come from collagen, but have been broken down into smaller chains of amino acids through hydrolysis. That is why supplement labels often use the terms collagen peptides and hydrolysed collagen together.
How long do collagen peptides take to work?
Think in weeks rather than days. Trials usually assess changes over several weeks; the study discussed above used eight weeks. Results vary, and neither supplements nor a peptide serum can guarantee a particular change in your skin.
Can you take collagen peptides every day?
Many collagen supplements are designed for daily use. Follow the product's directions, check its source and allergens, and count any added vitamins or minerals alongside your other supplements. Consistency is more useful than increasing the dose.
Is a collagen supplement better than a peptide serum?
They are different products. A supplement supplies ingredients through digestion, while a serum is used on the skin. Choose according to your preferences, nutritional needs and skin routine, and look for evidence relevant to the actual formulation.
What should I look for when buying collagen peptides?
Compare the source, daily collagen amount, hydrolysed form, allergens and added nutrients. Tablets, capsules and powders offer different serving sizes. Our collagen range lets you compare the formats and check the full ingredients and directions.
Can you use peptides with retinol or vitamin C?
Some routines and finished formulas combine these ingredients, but suitability depends on the products and your skin. Follow their instructions, introduce new products gradually and reduce use if irritation develops. Retinol is best used at night, with sun protection during the day, and should be avoided during pregnancy.
