
Paula's Choice Skin Balancing Ultra-Sheer Daily Defense Broad Spectrum SPF 30 (Old) is a product with 31 ingredients: Avobenzone, Homosalate, Octocrylene, Oxybenzone, Water, Butylene Glycol, Silica, Aluminum Starch Octenylsuccinate, Cetyl Dimethicone, Camellia Sinensis (Green Tea) Leaf Extract and 21 more.
Contains: Vitamins - Ascorbyl Palmitate (Vitamin C Palmitate), Panthenol; Antioxidant - Camellia Sinensis (Green Tea) Leaf Extract, Aloe Barbadensis (Aloe Vera) Leaf Juice Powder, Ascorbyl Palmitate (Vitamin C Palmitate), Superoxide Dismutase, Tocopherol, Ginkgo Biloba, Salix Alba (White Willow) Bark Extract;
Organic score: 29% natural, 61% chemical. Vegan - No; Cruelty free - Yes; Reef safe - No;
Positive effects
Concerns
INCI - Full Breakdown
Avobenzone is the only chemical UV-protection component with a broad spectrum coverage. It can help to block both UVA I and UVA II rays. It's safe and it is allowed to use at a 3% concentration in the USA and a 5% concentration in the EU countries.
There is one problem: avobenzone loses efficiency when exposed to the sun. If you are outside, it loses 36% of its ability to block UV rays an hour after application. That's why it's recommended to reapply sunscreen every 2 hours.
Octocrylene is an organic chemical sunscreen. It protects against UVA and UVB rays that can damage your skin or even lead to melanoma. It also stabilizes other sunscreen ingredients in a formulation and increases the water resistance of a product. It is approved by the FDA in concentrations of up to 10%. It’s not a very effective component on its own, that’s why manufacturers combine it with other chemical sunscreens.
Water is a great solvent. It’s neutral and doesn’t provide any strong positive or negative effects. It just helps components to mix better and to transport active components.

Butylene Glycol is a very popular synthetic alcohol. It helps the product to absorb deeper and faster. It is also a solvent for other ingredients. As for the skin benefits, it helps to attract water and helps to make the skin softer.
Silica is used for improving texture of the product. It helps the product to spread out evenly. Very often it’s used in different exfoliants as an abrasive. It's safe and non-toxic.

Green Tea Leaf Extract is a great antioxidant often used in Korean skincare products. It contains EGCG - the most effective flavonoid. It makes the skin look fresh, fills it with vitamines, and helps to prevent aging. It also helps to lower inflammation.
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