Best Korean peptide serum: COSRX Six Peptide or Mary&May for most, six more compared
Updated October 22, 2026
For most shoppers, the best Korean peptide serum is the COSRX The 6 Peptide Skin Booster Serum if you want a cheap, watery daily layer, or the Mary&May 6 Peptide Complex Serum if you want a short, fragrance-free list of six named peptides. Choose COSRX's Blue Peptide serum if you want a printed peptide percentage, Medicube PDRN Pink Peptide if you want PDRN in the same bottle, and the long-list serums from Centellian24, Neogen and Sungboon Editor only if their texture or format is worth 80 cents to $1.10 per ml.
This is a researched comparison of current US brand and retailer information, checked October 2026. We haven't worn or tested these serums; texture descriptions are the brands', and the buying advice comes from comparing ingredient lists, directions, sizes and prices. Peptide research is real but modest, and "botox-like" is a nickname, not a result.
What do peptides do in skincare?
In skincare, peptides are used in small amounts to help skin look smoother, firmer and more hydrated. They are short chains of amino acids, the building blocks of skin proteins such as collagen, and ingredient makers group them roughly by job:
Signal peptides, such as palmitoyl pentapeptide-4 and palmitoyl tripeptide-1, are designed to act as messengers that encourage the skin's own firmness proteins.
Carrier peptides, mainly copper tripeptide-1, carry copper, a trace mineral, and are among the better-studied peptides for the look of firmness.
Expression-line peptides, such as acetyl hexapeptide-8 (sold to brands under the trade name Argireline), are marketed for the lines that form when you frown or smile.
Most of the research is small studies of one peptide at a known strength, not tests of the finished serum you buy, and Korean labels rarely print peptide percentages. Our take: buy a peptide serum as a hydrating serum with a promising extra, and judge it on texture, fragrance, routine fit and price.
COSRX and Mary&May: the low-cost picks
COSRX The 6 Peptide Skin Booster Serum: the big bottle for the toner slot
COSRX calls this a watery, toner-like serum for the first step after cleansing, so it can stand in for your toner. Pump two or three doses into clean palms and press a light layer over the face, morning and evening, before serum and moisturizer.
Our product page doesn't print the full ingredient list. COSRX describes six peptides alongside niacinamide, adenosine, sodium hyaluronate, allantoin, N-acetylglucosamine and amino acids. When we read COSRX's own list for our COSRX 6 Peptide Skin Booster review, the six included copper tripeptide-1 and acetyl hexapeptide-8, the list also included soybean oil and t-butyl alcohol, and there was no fragrance entry.
It costs $16.99 for 150 ml at Sleepy Hello, checked October 2026: about 11 cents per ml, the lowest here by far. Skip it if you want something that feels like a serum; it is a prep layer, and dry skin still needs moisturizer on top.
Mary&May 6 Peptide Complex Serum: the shortest, most readable list
The ingredient list has 17 entries: water, glycereth-26, 1,2-hexanediol, butylene glycol, glycerin, arginine, carbomer, ethylhexylglycerin, polyglyceryl-10 laurate and adenosine, then caprylyl glycol and six peptides. Those are copper tripeptide-1, hexapeptide-11, hexapeptide-9, palmitoyl pentapeptide-4, palmitoyl tripeptide-1 and tripeptide-1.
Mary&May says it is fragrance-free and made without parabens, artificial colors and alcohol, and the 80 ml page adds vegan and cruelty-free. The brand describes a light, fast-absorbing texture. Apply it after toner over the face and neck, morning or evening, then moisturizer.
It is $9.29 for 30 ml (31 cents per ml), or $16.99 for the Mary&May 6Peptide Complex Serum 80 ml (21 cents per ml), checked October 2026. We'd put it first for anyone avoiding fragrance or new to peptides.
COSRX The Blue Peptide Bakuchiol Plump Glow Serum: the one with printed percentages
The COSRX The Blue Peptide Bakuchiol Plump Glow Serum is the only serum here that states its peptide strength: copper tripeptide-1 at 0.5% (5,000 ppm) and bakuchiol at 0.25% (2,500 ppm). COSRX adds five more peptides, niacinamide, hydrolyzed collagen, five forms of hyaluronic acid, panthenol, betaine and tocopherol (vitamin E).
Bakuchiol is a plant extract from babchi seeds, often positioned as a gentler alternative to retinol; it is not a retinoid. COSRX highlights this lightweight fluid for sensitive skin and retinol beginners.
Our product page doesn't print the full ingredient list, so we can't name the five other peptides or confirm whether fragrance is present. Apply it after toner, spreading outward from the center of the face and avoiding the eye area. It is $17.99 for 50 ml (36 cents per ml), checked October 2026.
Medicube's peptide serums: PDRN Pink Peptide and Hyaluronic Multi Peptide
Medicube PDRN Pink Peptide Serum: PDRN plus five peptides
The Medicube PDRN Pink Peptide Serum 30 ml we stock is the Salmon DNA PDRN version. PDRN is a DNA-fragment ingredient, listed as sodium DNA, used to help skin look plumper. The list opens with water, glycerin, dipropylene glycol, isopropyl myristate, glycereth-26, niacinamide, 1,2-hexanediol and sodium DNA.
The five peptides are acetyl hexapeptide-8, copper tripeptide-1, palmitoyl pentapeptide-4, palmitoyl tetrapeptide-7 and palmitoyl tripeptide-1. Cyanocobalamin (vitamin B12) gives the serum its pink color, and Medicube says it shouldn't stain. The list also includes milt extract, salmon egg extract, hydrolyzed collagen and atelocollagen, so it isn't vegan, and our product page notes that this version contains fragrance.
Our Medicube PDRN Pink Peptide Serum review covers the Rose PDRN version, which has a different ingredient list. Apply two or three drops to clean, dry skin after toner, morning or evening, before moisturizer. It is $20.99 for 30 ml (70 cents per ml), checked October 2026.
For oily or combination skin, the Medicube PDRN Pink Peptide Serum Ultra Light is the watery sibling at $18.99 for 30 ml (63 cents per ml), made without artificial fragrance according to Medicube. Its five peptides are copper tripeptide-1, dipeptide-2, oligopeptide-1, palmitoyl pentapeptide-4 and tripeptide-1, and it also lists fish extract and salmon egg extract.
Medicube Hyaluronic Multi Peptide Serum: two layers, 13 peptides
The Medicube Hyaluronic Multi Peptide Serum is a dual-layer bottle: a hydrating serum layer and an oil layer that you shake together before each use. The list opens with water, neopentyl glycol dicaprate (an emollient), propanediol, glycerin, 1,2-hexanediol, niacinamide and trehalose.
We counted 13 peptide names, including acetyl hexapeptide-8, copper tripeptide-1, nonapeptide-1, palmitoyl tripeptide-1 and palmitoyl tetrapeptide-7. It also carries sodium DNA (PDRN), alpha-arbutin, panthenol, squalane and jojoba seed oil. The list includes bergamot fruit oil, a citrus oil, so skip it if you avoid essential oils.
Medicube describes it as lightweight rather than heavy. After cleansing, shake, apply and pat in. It is $22.99 for 30 ml (77 cents per ml), checked October 2026, and suits dry or dehydrated skin that wants serum and a little oil in one step.
Centellian24, Neogen and Sungboon Editor: the long peptide lists
Centellian24 Lifting Peptide Serum: 42 peptides, with fragrance
Centellian24 advertises a 42-peptide complex in its Centellian24 Lifting Peptide Serum, and we counted 42 peptide and polypeptide names in the printed list, so the number matches the label. The list opens with water, glycerin, dipropylene glycol, polymethylsilsesquioxane (a silicone powder that softens the finish), niacinamide, methyl trimethicone, cetyl ethylhexanoate and bifida ferment lysate, with shea butter and soluble collagen close behind.
It also includes centella asiatica extract, elastin, hyaluronic acid and ceramide NP, and the ingredient list includes fragrance and alcohol. Centellian24 describes a concentrated, nourishing texture; spread an appropriate amount and let it absorb.
It is $25.00 for 30 ml (83 cents per ml), checked October 2026, and suits normal to dry skin that doesn't avoid fragrance.
Neogen Dermalogy Real Peptide Serum: capsules and a 13-peptide complex
The Neogen Dermalogy Real Peptide Serum is a clear serum with small suspended capsules that hold a 13-peptide complex, plus niacinamide, chaga mushroom extract and adenosine. Neogen notes that the color can change naturally after exposure to light.
Our product page doesn't print the full ingredient list, so we can't name the 13 peptides or check for fragrance; read the box if either matters to you. Apply it after toner, tap it in, and follow with face cream, morning and evening.
At $32.99 for 30 ml ($1.10 per ml), checked October 2026, it is the priciest per ml here; buy it for the capsule format rather than for anything the published facts prove.
Sungboon Editor Silk Peptide EGF Intensive Ampoule: the silk-peptide pick
The Sungboon Editor Silk Peptide EGF Intensive Ampoule 35 ml combines silk extract, a 13-peptide complex, EGF and collagen. We counted 13 peptide names, including sh-oligopeptide-1 (the ingredient name used for EGF), acetyl hexapeptide-8, copper tripeptide-1, palmitoyl pentapeptide-4 and caffeoyl hexapeptide-65.
The list opens with water, butylene glycol, glycerin, methylpropanediol, 1,2-hexanediol and niacinamide, and also includes hydrolyzed collagen, magnesium ascorbyl phosphate (a vitamin C derivative), several forms of hyaluronic acid, and mica and gold for the gold-colored particles. We found no fragrance entry. The brand describes a light, fluid texture.
A dosing applicator measures about 1 ml in the morning or 2 ml at night. It is $27.99 for 35 ml (80 cents per ml), checked October 2026. The Sungboon Editor Deep Collagen Silk Peptide EGF Intensive Ampoule 40 ml, which the brand describes as a 30-peptide formula, was $33.99 and sold out when we checked.
COSRX Six Peptide Skin Booster vs Medicube PDRN Pink Peptide Serum: which is better?
Neither is better overall, because they do different jobs. COSRX is a watery first layer for the toner slot at about 11 cents per ml; Medicube is a true serum step with PDRN, five named peptides and niacinamide at 70 cents per ml. Both list copper tripeptide-1 and acetyl hexapeptide-8. The additions you can verify in Medicube are PDRN (sodium DNA) and a serum rather than toner-like texture.
Pick COSRX if you want a low-cost daily hydrating layer, prefer a formula with no fragrance entry, or want to shorten your routine by replacing your toner.
Pick Medicube if you want PDRN in a serum, like a cushioned rather than watery feel, and don't mind fragrance or fish-derived ingredients.
Use both by applying COSRX straight after cleansing, then Medicube, then moisturizer.
How many peptides should a serum have?
There is no right number. A count tells you how many peptide names are on the label, not how much of each is in the bottle, so 42 peptides in Centellian24 doesn't mean seven times the effect of Mary&May's six.
A printed percentage tells you more: COSRX Blue Peptide's 0.5% copper tripeptide-1 is a number you can compare, and "multi-peptide complex" is not.
How to choose: on a budget, pick COSRX 6 Peptide or Mary&May; avoiding fragrance, Mary&May; wanting a printed percentage, COSRX Blue Peptide; wanting PDRN, Medicube PDRN Pink Peptide; dry skin that likes a little oil, Medicube Hyaluronic Multi Peptide.
The shortlist at Sleepy Hello, checked October 2026:
No. "Botox in a bottle" is a nickname, usually for serums with acetyl hexapeptide-8. Botox is a prescription injection that relaxes the muscle under a line, and a serum on the skin's surface can't do that. None of the eight product pages we checked uses the word botox; if you searched for a "silk peptide botox serum", the in-stock silk-peptide ampoule we carry is the Sungboon Editor ampoule above.
Peptide serum or retinol for fine lines: which should you start with?
Start with retinol if fine lines are your main goal and your skin handles it, because retinoids have the longer research record; begin two or three nights a week. A peptide serum is the easier start if retinol has bothered your skin before; our Korean retinol guide and Celimax Retinol Shot review cover beginner options.
Can you use a peptide serum with retinol or vitamin C?
Yes, with one caution. Peptide serums layer easily with retinol: apply the peptide serum in the morning and retinol at night, or both at night with the thinner product first. With vitamin C, a common cautious approach is to keep copper peptides, which at least seven of these eight serums include, apart from pure ascorbic acid, using vitamin C in the morning and the copper peptide serum at night.
Can you use two peptide serums at once?
You can, but many of these serums repeat the same peptides, such as copper tripeptide-1. The easiest pairing is COSRX 6 Peptide Skin Booster in the toner slot under one of the other serums. Either way, finish mornings with sunscreen.
Medicube Pink Peptide is our all-round PDRN serum pick; COSRX 5 PDRN is the best value at $0.17/ml. Six Korean formulas compared by source, texture, price.
How to use azelaic acid: apply after toner on dry skin, start once or twice a week and finish with SPF. Compare Anua, Medicube and Centellian24 10% serums.
