Peptide Skincare & BeautySkin science and ingredient guides

Ingredient or product comparison

Paula's Choice Peptide Booster Versus Carrot & Stick The Repair Serum

Paula's Choice Peptide Booster Versus Carrot & Stick The Repair Serum Detailed comparison of Paula's Choice Peptide Booster versus Carrot & Stick The Repair Serum. This anti-aging treatment is formulated around Tripeptide-1 and Palmitoyl Tripeptide-1 to soften

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Paula's Choice Peptide Booster Versus Carrot & Stick The Repair Serum Detailed comparison of Paula's Choice Peptide Booster versus Carrot & Stick The Repair Serum. This anti-aging treatment is formulated around Tripeptide-1 and Palmitoyl Tripeptide-1 to soften the look of wrinkles and refine skin texture. This barrier-repair serum is formulated around Niacinamide and Sh-Oligopeptide-1 to strengthen the skin barrier and soften the look of wrinkles. No concerns Water 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, 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 Niacinamide Acacia Senegal Gum Hydrolyzed Rhizobian Gum Camellia Sinensis Leaf Extract Chamomilla Recutita Flower Extract Sh-Oligopeptide-1 Sh-Oligopeptide-2 Sh-Polypeptide-1 Sh-Polypeptide-11 Sh-Polypeptide-9 Sodium Hyaluronate Acetyl Hexapeptide-8 Acetyl Glutamine Carnitine Caffeine Ruscus Aculeatus Root Extract Chenopodium Quinoa Seed Extract Bacillus Citrus Reticulata Peel Extract Codonopsis Lanceolata Extract Coix Lacryma-Jobi Ma-Yuen Seed Extract Chrysanthemum Parthenium Extract Digitaria Ciliaris Flower Extract Glycyrrhiza Glabra Root Extract Nelumbo Nucifera Seed Extract Paeonia Suffruticosa Root Extract Paeonia Albiflora Flower Extract Polygonum Odoratum Extract Polyglutamic Acid Xanthan Gum 1,2-Hexanediol Citric Acid Sodium Benzoate Sodium Levulinate Potassium Sorbate Water, Niacinamide, Glycerin, Acacia Senegal Gum, Hydrolyzed Rhizobian Gum, Camellia Sinensis Leaf Extract, Chamomilla Recutita Flower Extract, PCA, Sodium PCA, Sh-Oligopeptide-1, Sh-Oligopeptide-2, Sh-Polypeptide-1, Sh-Polypeptide-11, Sh-Polypeptide-9, Sodium Hyaluro These ingredients are found in both products. Ingredients higher up in an ingredient list are typically present in a larger amount. Alanine is an amino acid and is already found in the human body. Our skin uses alanine to build collagen, elastin, and keratin. Arginine is a semi-essential amino acid. This just means our bodies can product a bit on its own, but sometimes needs a little boost from food sources. It is a part of your skin's natural moisturizing factor (NMF), or the water-loving molecules in your outermost layer of skin (stratum corneum) that keeps everything hydrated and happy. Here's an interesting thing about Arginine: your skin converts it into urea through the Krebs-Henseleit urea cycle. Urea is one of the most effective humectants your skin naturally produces. A clinical study showed applying 2.5% arginine hydrochloride to atopic dermatitis skin showed significant urea levels in the stratum corneum and improved moisture in just four weeks. Arginine is also a precursor to nitric oxide; nitric oxide improves microcirculation and supports wound healing and collagen synthesis. One study found that an amino acid complex containing Arginine reduced skin irritation, improved hydration, and accelerated skin repair in clinical / in-vivo studies. Arginine itself is an amino acid and not a fatty acid, oil, or ester. On its own, it's not a direct food source for Malassezia, or the yeast that causes fungal acne. Aspartic Acid is an amino acid that our bodies produce naturally. It is an antioxidant. Our body uses Aspartic Acid to help build collagen and elastin. It also plays a role in hydrating skin. 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. Caprylyl Glycol is a humectant, skin conditioner, emollient, and preservative booster derived from either caprylic acid or synthetically created. Typical use levels vary from 0.3-1% as a preservative booster and go up to 2% to condition skin. Because it is not a free-fatty acid, this ingredient is fungal acne safe (there's nothing for Malassezia to feed on). Glycerin (or glycerol) is a compound naturally found in your skin. It's a powerhouse humectant that pulls water into the stratum corneum. Topically, glycerin does several things at once: Your skin makes glycerin on its own (mostly from sebaceous oil breakdown) and shuttles it to your outermost layer of skin, or your epidermis, via aquaporin-3. Aquaporin-3 is a transporter that is essential for normal skin hydration, elasticity, and repair. Interestingly, mice lacking in AQP3 have dry and less elastic skin that can be fully corrected with glycerin. This ingredient is non-irritating, plays well with almost every ingredient, and works across