Cien Sun SPF 50 Haute Protection Lotion

Vegan sunscreen

Key Ingredients
Antioxidant: Tocopheryl Acetate
Skin-identical ingredient: Glycerin
Sunscreen: Octocrylene, Ethylhexyl Salicylate, Butyl Methoxydibenzoylmethane, Diethylhexyl Butamido Triazone, Phenylbenzimidazole Sulfonic Acid

Other Ingredients
Antimicrobial/antibacterial: C12-15 Alkyl Benzoate
Antioxidant: Hydroxyacetophenone
Buffering: Potassium Hydroxide
Chelating: Caprylhydroxamic Acid
Emollient: C12-15 Alkyl Benzoate, Myristyl Alcohol
Emulsifying: Potassium Cetyl Phosphate
Moisturizer/humectant: Glycerin
Perfuming: Parfum
Preservative: Phenoxyethanol
Solvent: Aqua
Surfactant/cleansing: Potassium Cetyl Phosphate
Viscosity controlling: Myristyl Alcohol, Xanthan Gum, Sclerotium Gum

Ingredients explained
Aqua
Also-called: Water - What-it-does: solvent.
Good old water, aka H2O. The most common skincare ingredient of all. You can usually find it right in the very first spot of the ingredient. list, meaning it’s the biggest thing out of all the stuff that makes up the product.

It’s mainly a solvent for ingredients that do not like to dissolve in oils but rather in water.

Once inside the skin, it hydrates, but not from the outside - putting pure water on the skin (hello long baths!) is drying.

One more thing: the water used in cosmetics is purified and deionized (it means that almost all of the mineral ions inside it is removed). Like this, the products can stay more stable over time.

Octocrylene
What-it-does: sunscreen
An oil-soluble chemical sunscreen agent that protects skin in the UVB and somewhat in the UVA II range with a peak absorption of 304 nm. Its protection is not strong enough on its own but it is quite photostable (loses 10% of SPF protection in 95 mins) and is often used to stabilize other photo-unstable UV-filters, for example, Avobenzone. It is also often used to improve the water resistance of the products.

Octocrylene's safety profile is generally quite good, though a review study in Contact Dermatitis reports an "increasing number of patients with photo contact allergy to octocrylene." Mainly adults with ketoprofen-sensitivity and children with sensitive skin are affected, so if you have a small kid, it is probably better to use octocrylene-free sunscreens.

Glycerin - superstar
Also-called: Glycerol - What-it-does: skin-identical ingredient, moisturizer/humectant - Irritancy: 0  - Comedogenicity: 0 
A natural moisturizer that’s also in our skin.
A super common, safe, effective and cheap molecule used for more than 50 years.
Not only a simple moisturizer but knows much more: keeps the skin lipids between our skin cells in a healthy (liquid crystal) state, protects against irritation, helps to restore barrier.
Effective from as low as 3% with even more benefits for dry skin at higher concentrations up to 20-40%.
High-glycerin moisturizers are awesome for treating severely dry skin.