Zinc suncare has become a popular alternative for today's health-conscious consumer. According to a popular East Coast-based suncare company, the percentage of zinc added to the product determines it's SPF factor.
For example, 15% Zinc added equals an SPF of 15, and 20.5% of Zinc added equals an SPF of 30. As you can see the scale isn't linear. Also, they claim that as a natural sunblock Zinc far surpasses any synthetic based product due it's ability to stay on the skin for a longer time and physically not allow the sun's rays to penetrate the skin.
Non-Zinc based sunblocks work by "attempting" to "absorb" the sun's rays, whereas Zinc based sunblocks work by totally (physically) blocking them.
All higher end Zinc based sunblock products contain in addition to Zinc, essential oils like, extra virgin olive oil, Jojoba oil, etc. None of the natural oils will clog pores when used properly as they mimic the skin own oil barrier closest.
Thus, Zinc concentrations in sunscreen and moisturizers match that of the SPF or "Sun Protection Factor." High SPF formulas are water resistant, safe for children of all ages, block both UVA and UVB rays, and thoroughly moisturize while they protect your skin. These natural, physical barrier sunscreens are made with zinc oxide instead of chemicals.
SPF will remain strong after 40 minutes activity in the water or perspiring. For optimum protection, reapply sunscreen frequently, especially when in and out of the water.
According to the Environmental Working Group's Safe Cosmetics Database, Zinc-based sunblocks are some the world's safest and most effective sunscreens.
Benefits of Zinc Sunscreens and Moisturizers:
* Stays on the skin when you sweat or play in the water
* Won't run and drip into your eyes when you sweat
* Allows your skin to breathe
* Is strong and effective enough to protect you from extreme conditions
* Low to no irritating ingredients.
Some Zinc-based sunscreens use micronized zinc as their sun-screening agent. Zinc Oxide is a mineral that provides broad-spectrum protection against UVA and UVB rays. It is also said to have anti-inflammatory properties and is considered the safest and most protective sunscreening ingredient. While non micronized zinc oxide leaves a strong residue on the skin, like white paint, micronized zinc oxide creates the same barrier in a form that appears far more transparent and less whitening when rubbed in.
Micronized zinc oxide is produced by high temperature processing of minerals that contain zinc. Some brands contain micronized zinc oxide, combined with an inert ingredient derived from silica. The result is a naturally protective product to protect you from the sun's damaging rays.
Other sunscreens on the market contain chemical agents that do not provide broad spectrum protection, and many even contain chemical ingredients that are known toxins. So, be sure to read your label carefully!
What is the difference between “Physical Barrier” and “Chemical” Sunscreens?
Physical Barrier Sunscreens form a film on top of the skin that reflects or scatters UV light. Most physical barrier sunscreens contain either zinc oxide or titanium dioxide.
UV light is divided into three wavelength bands: UVA, UVB and UVC. UVA and UVB are the two that reach the earth and Physical Barrier sunscreens are effective at blocking both.
Chemical Sunscreens differ from physical barrier sunscreens as they absorb UV rays before they can do any damage. Usually, single chemical ingredients protect against either UVA or UVB, but not for both. So for broad-spectrum protection, you would need to choose a chemical sunscreen containing more than one active ingredient, most often two or three. Chemical sunscreens can be absorbed into the skin, are more likely to cause irritation or allergy, and can degrade over time.
References:
Learn more about skincare on the EWG's Cosmetic Database.
Links to some helpful web sites regarding sun protection.
