Answering your common questions about Sunscreen
What is the difference between a chemical and a physical sunscreens–and why we love our physical sunscreen?
So there is no doubt that as dermatologists, we recommend using sunscreen daily, but to answer one of the most commonly asked questions—does it need to be a chemical or physical sunscreen? Truth be told, we always recommend picking the sunscreen that you love most. Read below on the differences between physical and chemical sunscreens, and why we love our Inzincable® mineral sunscreen the most.
What are some of the main differences between chemical and physical sunscreens?
Chemical sunscreens contain organic ingredients and work via absorbing UV radiation and converting that into heat. Traditionally in the past were categorized as thinner and more cosmetically elegant, however occasionally due to the increase in certain ingredients like oxybenzone, benzophenones, and cinnamates, they are also more likely to cause an allergic reaction in some people.
Physical or mineral sunscreens contain a combination of either zinc oxide or titanium dioxide. They deflect the UV radiation off of our skin instead, although not as much as previously thought because some is absorbed here as well. These used to be associated with a white cast, making them less cosmetically elegant however recently with our formulation it is an accessible option for all skin tones.
What are some characteristics one should look for in a sunscreen?
We prefer one that is labeled broad spectrum. This distinction refers to the product protecting against both UVA and UVB radiation. UVA radiation makes up 95% of UV radiation, penetrates deeper into the skin, and is responsible for aging, UVB radiation is responsible for sunburns and is very carcinogenic causing the majority of skin cancers. SPF stands for “sun protection factor” however only indicates protection versus UVB radiation. This number is calculated based on how long it takes to burn the skin. A product with a SPF 15 blocks 93% of UVB rays, versus a SPF 30 blocks approximately 97% and a SPF 50 provides of close to 98% protection. Most dermatologists recommend a product with at least an SPF 30, and we often say SPF 50 for certain disorders or hyperpigmentation.
You should also find one that offers some water resistance. Sunscreens are no longer allowed to be labeled waterproof however instead water resistance is determined by how long a sunscreen can last on wet skin. Time limits include either 40 or 80 minutes, after which time sunscreen should be reapplied if wet.
Do you need to reapply sunscreen and if so how often?
Sunscreen should be applied every two hours for maximal benefits, especially if you are outdoors and exposed to sunlight. UV radiation comes through even on a cloudy day, which is why we recommend wearing sunscreen daily. Consider reapplication based on your daily exposures—working near windows, driving times throughout the day, or visible light exposure especially if you are prone to hyperpigmentation.
Sunscreen should be the last step of your skincare routine. Think of it like it is icing on a cake, the last step. We recommend completing your skincare routine first, applying our Inzincable sunscreen on, and then adding makeup on top if you choose.
How much sunscreen should I be using?
One ounce (a shots glass worth) is necessary for the exposed areas of an average adult sized body. A nickel sized amount (approximately one fourth of a teaspoon) is necessary for the face versus a quarter sized amount for the head and neck area. Another easy way to calculate it is to consider two full fingertips worth for an entire face, ranging from the base of both the index and middle fingers to the tip.
My makeup has sunscreen in it. Is that enough coverage?
Makeup with SPF often is not enough because people do not use enough. Our Inzincable sunscreen can be used as a makeup primer. Skincare then sunscreen then makeup.