I'm a big fan of zinc oxide for skincare because of its ability to both protect and repair skin. Zinc oxide is an inorganic compound having the formula ZnO. It can prevent sunlight and ultraviolet rays from penetrating the skin and can also act as a barrier to protect skin from outside irritants. As a sunscreen, zinc oxide reflects ultraviolet rays away from the skin and provides protection against sun damage. It is particularly effective against long-wave UVA rays and appears to block out the harmful rays without actually penetrating the skin.
In addition, zinc oxide has mild astringent and antiseptic properties making it useful for acne and wound care. It is suggested that zinc for acne is effective because it can kill bacteria that causes red bumps during breakouts. By killing bacteria, the inflammation is reduced and pores can then be easily cleaned. It may also reduce overall inflammation and its antioxidant properties can help reduce skin damage during breakouts. Zinc oxide has been used for a number of dermatological conditions beyond acne, including infections, rosacea, pigmentary disorders (melasma), and basal cell carcinoma. 
Why should acne sufferers be particularly careful about wearing a zinc oxide sunscreen? Tanning appears to cover up redness and dry up the surface of your skin, making some blemishes fade away temporarily. In reality, tanning causes skin irritation, especially if you stay out a bit too long and burn yourself. This adds to redness and leads to peeling, both of which may later aggravate the appearance of acne. Tanning also breaks down collagen. Collagen is one of your prime defenses against wrinkles because it keeps your skin elastic. When skin loses collagen, not only are you more likely to see wrinkles but your pores may appear larger as well.
Our 30+SPF Green Tea & Zinc Oxide Sunscreen uses 22.5% non-nano-particle, zinc oxide and is formulated to be free of any nasty chemicals. If you're heading to the beach or enjoying activities where you'll be spending hours in the sun, best to use a non-toxic, mineral based sunblock.
High SPF sunscreens might feel a bit heavy for daily wear on face and neck, and so with this in mind we developed our Raspberry & Green Tea Daily Defense. We designed this formula for daily use, and it includes 11% zinc-oxide to provide a significant physical barrier to reflect UVA/UVB rays. It makes a great under-makeup primer, and our customers who suffer from blemished skin find that it helps to control oiliness and acne.
Vitamin and antioxidant rich oils provide organic nutrients to replenish skin and guard against environmental depletion. Green tea extract and sea buckthorn oil soothe redness and promote skin cell regeneration to aid in repairing UV damage. Shea butter, raspberry seed, buriti fruit and hemp seed oils have the natural ability to absorb a spectrum of UV radiation and therefore provide an extra degree of sun protection.
1. Mrinal Gupta, et al., “Zinc Therapy in Dermatology: A Review,” Dermatology Research and Practice, July 10, 2014; http://www.hindawi.com/journals/drp/2014/709152/.