The Foundation: Water and Squalane
The most common skincare ingredient, water, also known as H2O, forms the foundation of many cosmetic products. The water used in cosmetics is purified and deionized, meaning that almost all of the mineral ions have been removed, ensuring a clean and stable base.
Squalane is a clear, colorless, and almost odorless oil that spreads beautifully and easily, leaving a velvety dry skin feel. It is an excellent companion for sunscreen agents, helping to solubilize them and making sunscreens feel lighter and spread more easily. Squalane's popularity stems from its chemical nature: it is a saturated hydrocarbon, making it a stable oily liquid with a long shelf life. It occurs naturally in certain fish and plant oils, such as olive oil, and is also produced by human skin as sebum. As described by f.c. on his blog, squalane's primary benefits include "emolliency, surface occlusion, and TEWL prevention all with extreme cosmetic elegance." In simpler terms, it is a superb moisturizer that leaves the skin smooth and soft without feeling heavy or greasy. Furthermore, squalane is compatible with virtually all skin types and conditions, making it a versatile ingredient.
Emollients and Moisturizers
Coconut oil and glycerin-derived ingredients are common emollients that contribute to a pleasant skin feel. These are light-textured, clear, odorless, and non-greasy, making them well-tolerated by all skin types and easy to incorporate into formulations.
Macadamia nut oil, a golden-yellow oil originating from Australia, is rich in emollient and nourishing fatty acids. Its high oleic acid content (50-67%) makes it highly emollient and ideal for dry skin types, though less suited for acne-prone skin. A unique characteristic of macadamia oil is its significant amount of palmitoleic acid (12-25%), which imparts a "cushiony" feel to the skin.
Marula oil, derived from the kernels of the Marula tree fruit, is a nourishing and moisturizing oil that can enhance skin hydration and smoothness, and even reduce redness. Traditionally used in South Africa for massage and as a body lotion, it is rich in fatty acids, including oleic (73%), palmitic (15%), and linoleic (9%) acids.
Emulsifiers and Stabilizers
Olivem 1000 is an ester derived from Cetearyl alcohol and olive oil fatty acids. Beyond its function as an emulsifier, it creates liquid crystal structures similar to the stratum corneum, the outermost layer of the skin. This property allows Olivem 1000 to act as an active ingredient with significant moisturizing, barrier-repairing, and soothing benefits. It also aids in the effective delivery of water-soluble actives and can boost SPF in sunscreen formulations, making it a true multi-tasker with pleasant sensory properties.
Fatty alcohols, such as Cetearyl alcohol (a blend of cetyl and stearyl alcohol), are common ingredients that provide a soft feel to the skin and add body to creams and lotions. Although chemically alcohols, they differ significantly from drying alcohols like denatured alcohol. They help stabilize oil-water mixtures without functioning as primary emulsifiers.
Polysorbates, like Polysorbate 20, are oil-loving molecules that help blend water and oil, acting as emulsifiers. While they can create water-in-oil emulsions, they are often used alongside water-loving emulsifiers to create smooth oil-in-water creams. They also function as wetting and dispersing agents, helping to evenly distribute insoluble particles like pigments and inorganic sunscreens.
Carbomers are large molecules (polymers of acrylic acid) that transform liquids into gel formulas. When neutralized with a base, they create viscous, clear gels with a non-tacky feel, making them popular for thickening cosmetic products.
Acrylates/C10-30 Alkyl Acrylate Crosspolymer is another polymer that aids in emulsifying and stabilizing oils in water-based formulas. It also acts as a thickening and gelling agent, creating smooth, non-sticky textures that are effective across a wide pH range, including low-pH formulations like exfoliants.
Preservatives
Phenoxyethanol is a widely used preservative, often referred to as the "IT-preservative." It is safe, gentle, and not a paraben, making it a preferred choice. Introduced around the 1950s, it can be used up to 1% globally and is found naturally in green tea, though the cosmetic version is synthetic. Beyond its safety profile, it is gentle on the skin.
Caprylyl Glycol is a multi-functional ingredient with a silky feel. It serves as an emulsion stabilizer, solvent, and broad-spectrum antimicrobial. Manufacturers also cite it as a moisturizer that enhances product feel on the skin.
Ethylhexylglycerin is a preservative that works against bacteria, fungi, and yeast. It is a common helper ingredient in cosmetic formulations.
Peptides and Amino Acids
Palmitoyl Hexapeptide-14 is an anti-aging peptide claimed to reduce the appearance of fine lines and wrinkles and promote more youthful-looking skin. A manufacturer study suggests its efficacy in reducing wrinkles is comparable to tretinoin (0.05%) without causing irritation.
Glutamic acid is a non-essential amino acid that acts as a humectant moisturizer and skin-conditioning agent. When multiple glutamic acid molecules are linked, they form polyglutamic acid, which is considered a superior humectant to hyaluronic acid. It may also play a role in skin barrier repair.
Serine, a non-essential amino acid, is often included in moisturizing complexes. It functions as a water-binding ingredient and contributes to proper skin hydration.
Threonine, a semi-essential amino acid, plays a role in regulating immune defense, allergic reactions, and inflammatory processes. In skincare, it acts as a moisturizer and may offer protection against some skin infections.
Proline, a non-essential amino acid, is a building block for skin proteins like collagen and elastin. While its production decreases with age, it is crucial for skin structure and hydration.
Glycine is an essential amino acid and a key building block for collagen and elastin. Orally, it aids digestion and nutrient absorption. In skincare, it primarily functions as a skin hydrator.
Leucine, a semi-essential amino acid, is a primary building block of hair keratin and skin collagen. It is a branched-chain amino acid claimed to enhance energy and aid muscle recovery when supplemented. In skincare, it acts as a skin-identical ingredient and moisturizer, potentially aiding barrier repair.
Valine, an essential amino acid, is a branched-chain amino acid found in sources like almonds and soy. It may promote protein synthesis and acts as a skin-identical ingredient and moisturizer, with potential barrier repair benefits.
Palmitoyl Tripeptide-1 is a famous peptide, part of the Matrixyl 3000 complex. This three-amino acid peptide (glycine-histidine-lysine) signals the skin to produce new collagen. When paired with Palmitoyl Tetrapeptide-7, it works synergistically to reduce wrinkles and create younger-looking skin.
Palmitoyl Tetrapeptide-7 is a four-amino acid peptide that reduces the production of interleukin-6 (IL-6), a molecule that promotes inflammation. Less inflammation leads to slower degradation of collagen and other vital components, resulting in a more youthful appearance.
Tetrapeptide-26 is a four-amino acid peptide claimed to improve puffy eye bags through anti-oedema and anti-glycation effects. Studies suggest visible improvements in puffiness for many users.
Palmitoyl Pentapeptide-4 is a peptide claimed to stimulate collagen production and inhibit enzymes that degrade collagen (MMPs), contributing to anti-aging effects.
Hexapeptide-11 is a four-amino acid peptide claimed to mimic the youth hormone thymopoietin.
Humectants and Hydrators
Sodium Hyaluronate is the salt form of hyaluronic acid, a well-known humectant and natural moisturizing factor. Hyaluronic acid is a large polymer found in the skin that acts like a sponge, helping the skin retain water, maintain plumpness, and elasticity. Sodium hyaluronate and hyaluronic acid are largely interchangeable in skincare, with both being effective humectants.
Other Ingredients
Propylene Glycol is a common glycol that enhances the freeze-thaw stability of products and acts as a humectant, solvent, and broad-spectrum antimicrobial.
Triethanolamine is a pH adjuster used in cosmetic formulations.
Hyaluronic Acid Boosting Serum Mechanism of Action
Sienna Rose Skincare Product Highlights
Sienna Rose Skincare offers a range of products featuring these beneficial ingredients. Some notable items include:
- Sienna Skin Care Microplush Robe ($125.00)
- VI Derm Growth Factor Repair Cream ($110.00)
- Jurlique Balancing Day Care Cream ($100.00)
- LightStim Recovery Loop 2 Pod Kit ($578.00)
- LightStim Recovery Loop 1 Pod Kit ($289.00)
- LightStim for Acne ($169.00)
- LightStim for Wrinkles ($249.00)
- LightStim Elipsa ($2,495.00)
- Odacite Revitalizing Facial Oil All-Embracing ($108.00)
- Odacite Hydra-Firm Body Cream C-Nourish ($52.00)
- Eve Taylor Soothing Aromatic Serum No.