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Welcome to Prequel's Skin Notes skincare blog. We’re passionate about skin health education. Skin Notes is a collection of articles that focus on skincare concerns, ingredients, technologies and more.
skincare ingredients with dark spots

Cosmetic Ingredients That Help With Dark Spots

Dark spots, also known as sunspots or age spots, are a frequent skin concern that can develop due to prolonged sun exposure or as part of the natural aging process. Using targeted cosmetic ingredients can aid in lessening the appearance of dark spots by promoting an even skin tone and enhancing skin health. 

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cosmetic ingredients for acne

Cosmetic Ingredients That Help With Acne

Acne-prone skin often requires a targeted approach, focusing on ingredients that tackle the primary causes of breakouts: excess oil or hyperseborrhea, clogged pores caused by hyperkeratinization, and hyperproliferation of Cutibacterium acnes (formally called P. acnes) bacteria. Acne symptoms can include comodones, blackheads, inflammation, redness, and excess oiliness. Acne is the most common skin condition in the United States and is considered a skin disease.

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skincare ingredients for aging skin

Cosmetic Ingredients That Help With Aging Skin

Aging skin experiences reduced elasticity, diminished moisture, and lower natural oil production. These changes contribute to wrinkles, fine lines, and a less vibrant complexion. Targeted ingredients can help mitigate these common signs of aging, improving skin health and appearance.

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how to patch test skin care

What Is Patch Testing In Skin Care?

By performing a patch test on a small area of skin, a person can see how their skin tolerates a product before committing to using the product over a larger area. When incorporating a new skin care item into your routine, not only is patch testing recommended but it is also a good idea to slowly acclimate your skin to a new product. Start by applying a new product once or twice a week then slowly build tolerance and incorporate as indicated on the product instructions.

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Lucent-C Vitamin C texture

Everything To Know About The Lucent-C Vitamin C Serum 15%

Our Lucent-C Vitamin C Serum 15% enhances the radiance, luminosity, and lucency of the skin while improving firmness and elasticity. It contains 15% l-ascorbic acid, the most biologically available and well studied form of vitamin C. L refers to the spatial isomer or enantiomer of ascorbic acid that the skin identifies and can use to improve the overall complexion and firmness of the skin.

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vitamin c in skincare

Vitamin C in Skincare

The biologically active isomer, also referred to as L-ascorbic acid, known to neutralize free radicals which helps combat the signs of skin aging and enhance tone and firmness.

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inulin in skincare

Inulin in Skincare

Inulin is a multifunctional ingredient extracted from chicory roots, that supports the skin microbiome and moisturizers. A natural prebiotic that acts as a powerful humectant for the skin. We're always adding more ingredient information - check back later for more on this ingredient.

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Ergothioneine in Skincare

Ergothioneine in Skincare

Ergothioneine is a natural amino acid antioxidant incorporated in skin care to help protect other active antioxidants from degrading, thus enabling them to maintain their integrity and provide defense against environmental concerns for an extended period of time. We're always adding more ingredient information - check back later for more on this ingredient.

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Ferulic Acid in Skincare

Ferulic Acid in Skincare

Ferulic Acid is an organic compound derived from plant cells. Utilized in skin care as a powerful antioxidant to help improve the visual signs of aging including helping to even skin tone. We're always adding more ingredient information - check back later for more on this ingredient.

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cosmetic ingredients that help rosacea

Cosmetic Ingredients That Help With Rosacea

Rosacea is a chronic skin condition characterized by redness/erythema, inflammation, facial flushing, telangiectasia, and sometimes acne-like bumps. Managing rosacea often involves using gentle ingredients that soothe the skin and reduce topical inflammation as well as incorporating ingredients that keep the skin hydrated. Some ingredients can also help to reduce signs of rosacea by reducing vasodilation which leads to flushing and redness.

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cosmetic ingredients for skin barrier repair

Cosmetic Ingredients That Help Repair The Skin Barrier

The skin barrier is the outermost layer of the skin, responsible for keeping moisture in and harmful elements out. It is often described as having a brick and mortar structure with skin cells embedded in a lipid matrix that limits penetration of allergens, pollution, and microbes while helping skin retain its moisture content. When this barrier is compromised, skin can become dry, sensitive, and prone to irritation. It can also lead to skin concern flare ups such as eczema and rosacea. Here's a list of ingredients known for their ability to help rejuvenate the skin barrier.

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Niacinamide in Skincare

Niacinamide is a stable form of Vitamin B3 that can be used for most skin types, even those with sensitive skin. It delivers overall skin improvements including smoothing skin texture, evening skin tone and locking in moisture.

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Panthenol in Skincare

Panthenol in Skincare

Also known as provitamin B5, D-panthenol (dexpanthenol) is the most active isomeric form utilized for its moisturizing and soothing properties. Particularly effective in hydrating the skin and enhancing its texture and elasticity.

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dermatologist tested meaning

What Does "Dermatologist Tested" Mean?

Dermatologist-tested means safety testing takes place under the supervision of a dermatologist. Safety testing performed under the supervision of a dermatologist can include RIPT (repeated insult patch testing), which tests the irritation and sensitization potential of a product, as well as safety-in-use testing which reflects typical consumer use and exposure to a product. During such testing, a dermatologist will observe, record, and evaluate any skin reactions to confirm or not the irritation potential or allergenicity of the product which ultimately affirms the product’s safety.

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DISCLAIMER: All skin care articles are intended to help educate on specific ingredients and skin care topics. Our articles are written to be informative and informational. They are not indicative of individual performance. Results may vary per applicant. Any reference to a specific patient experience is not a medical suggestion for treatment. Please note that any Prequel products with referenced ingredients are formulated for Cosmetic Use Only and NOT intended as replacements for physician advice and/or pharmaceutical product recommendations.


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