The short answer. Collagen tripeptide is collagen that has already been cut into three-piece fragments (glycine–proline–hydroxyproline, written Gly-Pro-Hyp) before you take it. In placebo-controlled trials it has supported skin hydration and elasticity at about 1 gram a day. Regular hydrolysed collagen is usually studied at 2.5 to 10 grams a day. Both can work. The tripeptide's difference is how little of it the trials needed.
What is collagen tripeptide?
Collagen is the protein that gives skin its structure. When you drink it, your body doesn't use it whole. It breaks it down into small pieces, two or three building blocks long, and those pieces travel in the blood.
Collagen tripeptide skips part of that work. It is made by cutting collagen into the three-block piece in advance, so a large share of what you take is already the fragment the body looks for. Most collagen tripeptide comes from fish (marine collagen).
How is it different from regular collagen?
| Regular hydrolysed collagen | Collagen tripeptide | |
|---|---|---|
| What it is | Collagen cut into peptides of mixed sizes | Collagen cut mostly into the three-block piece, Gly-Pro-Hyp |
| Dose used in skin trials | Usually 2.5–10 g a day | Usually 1 g a day (3 g in one trial) |
| What shows up in the blood | Mainly two-block pieces (Pro-Hyp) | The three-block piece itself, which then also becomes the two-block piece |
| Human skin trials | Many, across several forms | Several, mostly run with the ingredient's makers |
What do the human trials show?
- 2018, Nutrients: 64 women aged 40 to 60 took 1 g of collagen tripeptide or a placebo every day for 12 weeks. Skin hydration was better from week 6, wrinkles improved, and two of three elasticity measures were better than placebo.
- 2021, Journal of Food and Nutrition Research: 73 women aged 40 to 55, 1 g a day for 12 weeks. Roughness and moisture around the eyes were better than placebo at 6 and 12 weeks.
- 2026, Journal of Medicinal Food: 114 women aged 20 to 50, 1 g a day for 24 weeks. Roughness and elasticity were better than placebo at 12 and 24 weeks, and blood levels of Gly-Pro-Hyp were about 54 times higher than after ordinary collagen.
- 2014, Journal of Cosmetic and Laser Therapy: 32 adults, 3 g a day for 12 weeks. Hydration and elasticity improved compared with a group that took nothing.
Not every trial was positive. In a 2021 trial of 84 women (Frontiers in Medicine), only water loss through the skin improved; hydration, elasticity and wrinkles did not differ from placebo. And almost all of these trials were run or co-written by the companies that make the ingredient. That is common in this field, and worth knowing.
Does collagen tripeptide work better than regular collagen?
The honest answer: the trials point to a lower working dose, not a proven bigger result.
- Regular collagen works too. A 2017 trial of 71 women found that 3 g a day of ordinary collagen peptides improved moisture, elasticity and wrinkles over 12 weeks.
- Only one small trial has put collagen tripeptide directly against ordinary collagen: 13 people with atopic dermatitis in 2017, where the tripeptide group improved and the ordinary-collagen group did not. It is too small to settle the question.
- No trial has compared collagen tripeptide with dipeptide-rich collagen, the other "advanced" form. We searched the English, Japanese, Korean and Chinese research and found none.
So the tripeptide's real advantage is efficiency: the skin trials used about a gram a day, where regular collagen's used several.
Does the body actually absorb it?
Yes, and this is the best-documented part. In a 2017 study, Gly-Pro-Hyp was the most increased collagen fragment in human blood after a tripeptide-rich collagen. A 2016 study showed it also turns into the two-block piece, Pro-Hyp, after it is absorbed. In mice, it reached the skin. So a tripeptide delivers both pieces.
How much collagen tripeptide should you take?
The skin trials used 1 g a day, and one used 3 g. People have taken collagen tripeptide at anywhere from 1 to 16 grams a day in studies; a six-month study at 16 g a day reported no side effects. Most trials measured results at 6 and 12 weeks, so give any collagen at least that long.
Because most collagen tripeptide is made from fish, check the label if you have a fish allergy.
How Glow State uses it
Glow State carries 3,000 mg of HACP® marine collagen tripeptide in every sachet. HACP® is made by Jellice in Japan, and it is the collagen tripeptide used in the 2018 trial above.
That is more than the 1,000 mg the trial used, and still a modest amount of collagen. Regular collagen is usually taken at 2.5 to 10 grams a day, collagen tripeptide has been studied at up to 16 grams a day for six months with no side effects, and 3 grams of collagen is about half the protein in one egg. We chose 3,000 mg so every sachet comfortably clears the amount that worked in the trials.
The same sachet carries vitamin C, which the body needs to build collagen, and zinc. More about each one is on our Ingredients page, and the full formula is on Glow State.
Questions people ask
Is collagen tripeptide the same as hydrolysed collagen? Both are collagen broken down for easier absorption. Hydrolysed collagen is a mix of peptide sizes; collagen tripeptide is cut mostly into the three-block piece, Gly-Pro-Hyp.
How long does collagen tripeptide take to work? In the trials, the first skin differences were measured at 6 weeks and most results were reported at 12 weeks.
Can men take collagen tripeptide? Yes. Most skin trials so far enrolled women; a 2026 trial in Taiwan enrolled adults aged 25 to 65. Collagen is made the same way in everyone's skin, though trials in men are still few.
Is collagen tripeptide vegan? No. Collagen comes from animals, and most collagen tripeptide, including HACP®, comes from fish.
Is 3,000 mg of collagen too much? No. Collagen is a food protein, and 3 grams is about half the protein in one egg. Regular collagen is usually taken at 2.5 to 10 grams a day, and collagen tripeptide has been studied at up to 16 grams a day for six months with no side effects.
Is it safe to take every day? The trials gave it daily for up to 24 weeks, and a six-month study at 16 g a day reported no side effects. If you have a fish allergy or a medical condition, ask your doctor first.
Sources - Nutrients 2018 — PMID 29949889 - Frontiers in Medicine 2021 — PMID 33521019 - Journal of Food and Nutrition Research 2021, 9(10) — sciepub - Journal of Medicinal Food 2026 — PMID 41788055 - Journal of Cosmetic and Laser Therapy 2014 — PMID 24131075 - Journal of Dermatological Science 2017 — PMID 29017796 - Biological and Pharmaceutical Bulletin 2016 — PMID 26934933 - Journal of Agricultural and Food Chemistry 2017 — PMID 28244315 - Journal of Atherosclerosis and Thrombosis 2017 — PMID 27725401 - International Journal of Peptide Research and Therapeutics 2017 - Journal of Cosmetic Dermatology 2026 — PMID 41918155
With love,
Kara