Free Esthetician Practice Cosmetic Chemistry and Ingredients Questions and Answers — Questions and Answers
Question 1: A client with oily, congested, and acne-prone skin is looking for a chemical exfoliant. Which of the following ingredients would be MOST beneficial due to its oil-solubility and ability to exfoliate inside the pore lining?
- Salicylic Acid (Correct answer)
- Glycolic Acid
- Lactic Acid
- Mandelic Acid
Correct answer: Salicylic Acid
Salicylic acid is a Beta-Hydroxy Acid (BHA), which is oil-soluble. This property allows it to penetrate into the pores to exfoliate dead skin cells and dissolve sebum, making it highly effective for treating acne and congestion. AHAs like glycolic, lactic, and mandelic acid are water-soluble and work primarily on the skin's surface.
Question 2: When examining the ingredient label of a cosmetic product, how are the ingredients required to be listed according to INCI regulations?
- Alphabetically by their common name
- In descending order of predominance by weight (Correct answer)
- Grouped by function (e.g., all preservatives together)
- In ascending order of concentration
Correct answer: In descending order of predominance by weight
The International Nomenclature of Cosmetic Ingredients (INCI) system requires that ingredients be listed in descending order of concentration from highest to lowest. Ingredients present at a concentration of 1% or less may be listed in any order after those present at more than 1%.
Question 3: Lotions and creams are examples of what type of cosmetic formulation, which consists of two or more immiscible substances (like oil and water) united with the aid of a binder?
- Solutions
- Suspensions
- Emulsions (Correct answer)
- Anhydrous bases
Correct answer: Emulsions
Emulsions are mixtures of oil and water, which normally do not mix. An ingredient called an emulsifier is added to join these two phases together to create a stable product like a cream or lotion. Solutions are stable mixtures of soluble ingredients, suspensions contain solid particles distributed in a liquid, and anhydrous bases contain no water.
Question 4: A client with dehydrated skin would benefit most from products containing ingredients that attract and bind water to the skin. Which of the following ingredients is a powerful humectant known for this property?
- Petrolatum
- Dimethicone
- Cetyl Alcohol
- Hyaluronic Acid (Correct answer)
Correct answer: Hyaluronic Acid
Hyaluronic acid is a potent humectant that can hold up to 1,000 times its weight in water, making it excellent for hydrating the skin by drawing moisture in. Petrolatum and Dimethicone are primarily occlusive and emollient, forming a barrier to prevent water loss, while Cetyl Alcohol is a fatty alcohol used as an emulsifier or thickener.
Question 5: What is the primary function of antioxidants, such as Vitamin C and Vitamin E, in a skincare formulation?
- To neutralize free radicals and prevent oxidative damage (Correct answer)
- To act as surfactants for cleansing purposes
- To increase the pH of the product for better penetration
- To bind water to the epidermis for hydration
Correct answer: To neutralize free radicals and prevent oxidative damage
Antioxidants are molecules that protect the skin from damage caused by free radicals, which are unstable atoms generated by UV exposure and pollution. They work by donating an electron to stabilize the free radical, preventing it from causing cellular damage, which contributes to premature aging.
Question 6: A client asks for a recommendation for a "physical" sunscreen because they have sensitive skin. Which of the following active ingredients would you look for on the product label?
- Avobenzone
- Oxybenzone
- Octinoxate
- Zinc Oxide (Correct answer)
Correct answer: Zinc Oxide
Zinc Oxide and Titanium Dioxide are the two mineral (physical) sunscreen filters recognized as safe and effective by the FDA. They work by sitting on top of the skin to physically block or reflect UV rays. Avobenzone, Oxybenzone, and Octinoxate are all examples of chemical sunscreen filters.
Free Esthetician Practice Cosmetic Chemistry and Ingredients Questions and Answers
A client with oily, congested, and acne-prone skin is looking for a chemical exfoliant.
Which of the following ingredients would be MOST beneficial due to its oil-solubility and ability to exfoliate inside the pore lining?