Paula's Choice Peptide Booster Versus Medik8 Liquid Peptides
Updated on July 18, 2024
Overview
What they are
These products are both cruelty-free and reef safe . They have a total of 10 ingredients in common
Cool Features
They both contain AHA and peptides
Suited For
They're both likely to be good for anti aging, dry skin, brightening skin, sensitive skin, oily skin, reducing pores, scar healing, dark spots and better texture
Free From
They both do not contain any harsh alcohols, common allergens, oils, parabens or sulfates
We independently verify ingredients, and our claims are backed by peer-reviewed research. Spot a product that needs an update? Let us know.
Ingredient Info
Paula's Choice Peptide Booster 56 ingredients
Medik8 Liquid Peptides 33 ingredients
What's inside (and what isn't)
What's inside (and what isn't)
At a glance
Click on any of the items below to learn more
Paula's Choice Peptide Booster 56 ingredients
Medik8 Liquid Peptides 33 ingredients
Key Ingredients
Benefits
Concerns
Key Ingredients
Benefits
Concerns
Ingredients Side-by-side
Water
Skin ConditioningGlycerin
Humectant
PEG-8 Dimethicone
Emulsifying
Tripeptide-1
Skin Conditioning
Palmitoyl Tripeptide-1
Skin Conditioning
Palmitoyl Tetrapeptide-7
Skin Conditioning
Palmitoyl Hexapeptide-12
Skin Conditioning
Myristoyl Hexapeptide-16
Skin Conditioning
Myristoyl Pentapeptide-17
Skin Conditioning
Hexanoyl Dipeptide-3 Norleucine Acetate
Skin Conditioning
Azelaoyl Bis-Dipeptide-10
Skin Conditioning
Glycoproteins
Skin Conditioning
Phospholipids
Skin Conditioning
Adenosine
Skin Conditioning
Dipotassium Glycyrrhizate
Humectant
Arginine
Masking
Valine
MaskingGlycine
Buffering
Alanine
MaskingGlutamic Acid
Humectant
Serine
Masking
Threonine
Yeast Extract
Skin Conditioning
Isoleucine
Skin ConditioningProline
Skin ConditioningHistidine
Humectant
Phenylalanine
Masking
PCA
Humectant
Phytic Acid
Panax Ginseng Root Extract
Emollient
Sodium PCA
Humectant
Psidium Guajava Fruit Extract
AstringentEuterpe Oleracea Fruit Extract
Ahnfeltiopsis Concinna Extract
Skin Conditioning
Dextran
Hydrolyzed Silk
Humectant
Lecithin
Emollient
Glyceryl Polymethacrylate
C12-16 Pareth-9
EmulsifyingTrideceth-12
EmulsifyingSodium Lactate
BufferingCarbomer
Emulsion StabilisingAspartic Acid
Masking
Polysorbate 20
Emulsifying
Butylene Glycol
Humectant
Caprylyl Glycol
EmollientPEG-8
HumectantC11-15 Pareth-7
EmulsifyingGuar Hydroxypropyltrimonium Chloride
Skin ConditioningPhytosteryl/Octyldodecyl Lauroyl Glutamate
Skin ConditioningEctoin
Skin Conditioning
Citrate Buffer
Trimethylsiloxyamodimethicone
Phenoxyethanol
Preservative
Sodium Hydroxide
BufferingEthylhexylglycerin
Skin ConditioningWater, Glycerin, PEG-8 Dimethicone, Tripeptide-1, Palmitoyl Tripeptide-1, Palmitoyl Tetrapeptide-7, Palmitoyl Hexapeptide-12, Myristoyl Hexapeptide-16, Myristoyl Pentapeptide-17, Hexanoyl Dipeptide-3 Norleucine Acetate, Azelaoyl Bis-Dipeptide-10, Glycoproteins, Phospholipids, Adenosine, Dipotassium Glycyrrhizate, Arginine, Valine, Glycine, Alanine, Glutamic Acid, Serine, Threonine, Yeast Extract, Isoleucine, Proline, Histidine, Phenylalanine, PCA, Phytic Acid, Panax Ginseng Root Extract, Sodium PCA, Psidium Guajava Fruit Extract, Euterpe Oleracea Fruit Extract, Ahnfeltiopsis Concinna Extract, Dextran, Hydrolyzed Silk, Lecithin, Glyceryl Polymethacrylate, C12-16 Pareth-9, Trideceth-12, Sodium Lactate, Carbomer, Aspartic Acid, Polysorbate 20, Butylene Glycol, Caprylyl Glycol, PEG-8, C11-15 Pareth-7, Guar Hydroxypropyltrimonium Chloride, Phytosteryl/Octyldodecyl Lauroyl Glutamate, Ectoin, Citrate Buffer, Trimethylsiloxyamodimethicone, Phenoxyethanol, Sodium Hydroxide, Ethylhexylglycerin
Water
Skin ConditioningGlycerin
Humectant
Butylene Glycol
Humectant
Inulin
Skin ConditioningSodium Hyaluronate
Humectant
Panthenol
Skin Conditioning
Alpha-Glucan Oligosaccharide
CleansingCarnosine
Skin Conditioning
Carbomer
Emulsion StabilisingPolysorbate 20
Emulsifying
Caprylyl Glycol
EmollientPhenoxyethanol
Preservative
Hydroxypropyl Cyclodextrin
MaskingDunaliella Salina Extract
Skin ConditioningEthylhexylglycerin
Skin ConditioningCitric Acid
Buffering
Palmitoyl Tripeptide-5
Skin Conditioning
Sodium Benzoate
Masking
Acetyl Hexapeptide-8
Humectant
Tetrapeptide-21
Skin Conditioning
Pentapeptide-18
Skin Conditioning
Palmitoyl Tripeptide-1
Skin Conditioning
Pantolactone
Humectant
Palmitoyl Tripeptide-38
Skin Conditioning
Palmitoyl Tetrapeptide-7
Skin Conditioning
Glyceryl Caprylate
EmollientLactic Acid/Glycolic Acid Copolymer
Skin ConditioningPolyvinyl Alcohol
Phenylpropanol
Masking
Copper Palmitoyl Heptapeptide-14
Skin Conditioning
Heptapeptide-15 Palmitate
Skin Conditioning
Potassium Sorbate
Preservative
Xanthan Gum
EmulsifyingWater, Glycerin, Butylene Glycol, Inulin, Sodium Hyaluronate, Panthenol, Alpha-Glucan Oligosaccharide, Carnosine, Carbomer, Polysorbate 20, Caprylyl Glycol, Phenoxyethanol, Hydroxypropyl Cyclodextrin, Dunaliella Salina Extract, Ethylhexylglycerin, Citric Acid, Palmitoyl Tripeptide-5, Sodium Benzoate, Acetyl Hexapeptide-8, Tetrapeptide-21, Pentapeptide-18, Palmitoyl Tripeptide-1, Pantolactone, Palmitoyl Tripeptide-38, Palmitoyl Tetrapeptide-7, Glyceryl Caprylate, Lactic Acid/Glycolic Acid Copolymer, Polyvinyl Alcohol, Phenylpropanol, Copper Palmitoyl Heptapeptide-14, Heptapeptide-15 Palmitate, Potassium Sorbate, Xanthan Gum
Ingredients Explained
These ingredients are found in both products.
Ingredients higher up in an ingredient list are typically present in a larger amount.
Butylene Glycol (or BG) is used within cosmetic products for a few different reasons:
Overall, Butylene Glycol is a safe and well-rounded ingredient that works well with other ingredients.
Though this ingredient works well with most skin types, some people with sensitive skin may experience a reaction such as allergic rashes, closed comedones, or itchiness.
Learn more about Butylene GlycolCaprylyl Glycol is a humectant and emollient, meaning it attracts and preserves moisture.
It is a common ingredient in many products, especially those designed to hydrate skin. The primary benefits are retaining moisture, skin softening, and promoting a healthy skin barrier.
Though Caprylyl Glycol is an alcohol derived from fatty acids, it is not the kind that can dry out skin.
This ingredient is also used as a preservative to extend the life of products. It has slight antimicrobial properties.
Learn more about Caprylyl GlycolCarbomer is a polymer of acrylic acid. Its main role is to create a gel consistency.
A high amount of carbomer can cause pilling or balling up of products. Don't worry, most products contain 1% or less of carbomer.
Ethylhexylglycerin (we can't pronounce this either) is commonly used as a preservative and skin softener. It is derived from glyceryl.
You might see Ethylhexylglycerin often paired with other preservatives such as phenoxyethanol. Ethylhexylglycerin has been found to increase the effectiveness of these other preservatives.
Glycerin is already naturally found in your skin. It helps moisturize and protect your skin.
A study from 2016 found glycerin to be more effective as a humectant than AHAs and hyaluronic acid.
As a humectant, it helps the skin stay hydrated by pulling moisture to your skin. The low molecular weight of glycerin allows it to pull moisture into the deeper layers of your skin.
Hydrated skin improves your skin barrier; Your skin barrier helps protect against irritants and bacteria.
Glycerin has also been found to have antimicrobial and antiviral properties. Due to these properties, glycerin is often used in wound and burn treatments.
In cosmetics, glycerin is usually derived from plants such as soybean or palm. However, it can also be sourced from animals, such as tallow or animal fat.
This ingredient is organic, colorless, odorless, and non-toxic.
Glycerin is the name for this ingredient in American English. British English uses Glycerol/Glycerine.
Learn more about GlycerinPalmitoyl Tetrapeptide-7 is a lab-made peptide with anti-inflammatory and skin-repairing benefits. It's made up of four amino acids (glycine, glutamine, proline, and arginine) and palmitic acid (which helps it penetrate skin more effectively).
This ingredient helps reduce inflammation by limiting the production of interleukin-6 (IL-6), a chemical that triggers inflammatory responses, particularly after UV exposure.
Less inflammation = slower collagen breakdown and a longer-lasting, youthful appearance.
Palmitoyl Tetrapeptide-7 also stimulates collagen production and supports a healthier skin barrier.
Over time, this can improve skin firmness, hydration, and reduce the appearance of fine lines. It’s commonly paired with Palmitoyl Tripeptide-1 in the well-known Matrixyl 3000 complex for enhanced anti-aging effects.
This ingredient has been shown to be effective and safe in cosmetic use and you'll typically find it in small amounts (less than 0.01%).
Due to its palmitic acid base, it may not be safe for Malassezia folliculitis.
Read more about other common types of peptides here:
Learn more about Palmitoyl Tetrapeptide-7Palmitoyl Tripeptide-1 is also known as pal-GHK. It is made up of 3 amino acids and palmitic acid, a fatty acid that helps it absorb into skin more easily.
This peptide is as a signal peptide, meaning it tells the skin to produce more collagen. Collagen is the key protein that helps form the skin's structure and keep it plump, firm, and hydrated.
By boosting collagen production, this ingredient supports a stronger skin barrier and helps reduce the appearance of wrinkles.
You'll most likely see this ingredient paired with Palmitoyl Tetrapeptide-7 in the well-known Matrixyl 3000 complex. While results from in-house testing should be viewed cautiously, this peptide duo is among the most studied and widely used in modern skincare.
Due to its palmitic acid base, this ingredient may not be safe for Malassezia folliculitis.
Read more about other common types of peptides here:
Learn more about Palmitoyl Tripeptide-1Phenoxyethanol is a preservative that has germicide, antimicrobial, and aromatic properties. Studies show that phenoxyethanol can prevent microbial growth. By itself, it has a scent that is similar to that of a rose.
It's often used in formulations along with Caprylyl Glycol to preserve the shelf life of products.
Polysorbate 20 is made by combining ethoxylation of sorbitan, ethylene oxide, and lauric acid. It is a mild cleansing agent, surfactant, and emulsifier.
As a surfactant, it helps collect dirt and oils for washing. Emulsifiers prevent oils and water from separating.
Polysorbate 20 also adds scent to a product. Since it is made using sorbitol, it has a sweet scent. Sorbitol can also be found in fruits such as apples and peaches.
The lauric acid used to create Polysorbate 20 is often derived from coconuts.
Polysorbate 20 may not be fungal acne safe.
Learn more about Polysorbate 20Water. It's the most common cosmetic ingredient of all. You'll usually see it at the top of ingredient lists, meaning that it makes up the largest part of the product.
So why is it so popular? Water most often acts as a solvent - this means that it helps dissolve other ingredients into the formulation.
You'll also recognize water as that liquid we all need to stay alive. If you see this, drink a glass of water. Stay hydrated!
Learn more about WaterIngredient Ratings
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When to use
Paula's Choice Peptide Booster 56 ingredients
Medik8 Liquid Peptides 33 ingredients
Reviews
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