jueves, 12 de julio de 2012

Como hacer tu protector solar casero sin quimicos ni riesgos.


from:
http://www.hardlotion.com/blog/2012/5/2/how-to-make-your-own-homemade-sunscreen.html#

How to Make Your Own Homemade Sunscreen

Homemade Sunscreen
Three reasons you should make your own:

  1. Control your ingredients: zinc oxide offers the best sun protection with a low hazard rating (per EWG). You can create a high or low SPF when you make it yourself.
  2. Four ingredients and 30 minutes is all you need.
  3. No need to worry about expired sunscreen in the cupboard. Make fresh sunscreen that lasts all summer long (plan for a year shelf life).

Instructions: Melt ½ oz beeswax, 2 oz shea butter, and 2 oz coconut oil using the double boiler method (Pyrex or glass container with ingredients, sitting in a pot of  boiling water until mixture is melted).
Remove from heat. Add 1 oz (2 TBS) zinc oxide to melted mixture and using a stick blender, blend until all zinc oxide is well-blended. Pour into a glass or plastic container. Sunscreen is ready when solidified.
Important: clean your equipment while it's still hot. Immediately wipe everything with paper towels to get rid of the residue as much as possible. Then wash in hot, soapy water with a scrub brush.
This is approximately 30 spf – I wouldn’t add more zinc oxide than the recipe calls for unless you can handle the extra “whiteness” which might be difficult to rub into the skin. Use less zinc oxide for a lower spf. 
For a video and more summer skin care recipes, see the My Buttered Life ebook

Zinc, para pantallas solares caseras


http://www.hardlotion.com/blog/2012/6/28/can-we-trust-zinc-oxide.html


Can We Trust Zinc Oxide?


Whether it’s rash cream, sunscreen, itch relief salve or wound care, there’s a common ingredient listed in a variety of skin care products: zinc oxide.  If zinc oxide can truly be counted on to prevent or treat a wide range of skin conditions, the next question is, is it safe?
 After reading up on what the experts say, I continue to bank my confidence on this mineral and here’s why:
  1. Chemical sunscreen ingredients like oxybenzone (in 60% of sunscreen products) penetrate the skin and enter the bloodstream, potentially disrupting the hormonal system. Physical or mineral sunscreen ingredients, like zinc oxide and titanium dioxide, reflect the sun like a mirror, and keep the sun’s rays from reaching your skin.  Unlike oxybenzone, zinc oxide is non-toxic.
  2. Authorities like Dr. Mercola, the Environmental Working Group, and Dr. Sears recommend using a sunscreen with zinc oxide as the primary sunscreen ingredient. It is the broadest spectrum UVA and UVB reflector that is approved for use as sunscreen by the FDA, and has a time-tested safety record.
  3. We’ve used our homemade rash cream and sunscreen on our own family and we’ve found that diaper rash disappears, chaffed skin from rubbing heals quickly, and sunburns are avoided. 
So what’s the deal with the nanoparticle controversy and is zinc oxide linked to cancer?
            A nanometer refers to size, and one nanometer is 100,000 times thinner than a strand of hair. There was concern that particles less than 30 nanometers could be absorbed through the skin and into the bloodstream. Cosmetic companies preferred the smaller particle-sized zinc oxide because the finished product could be applied without excessive whiteness to the skin. It turns out, there are no studies proving that nanoparticles of zinc oxide could penetrate healthy human skin, and studies linking zinc oxide to cancer have been inconclusive. To calm customer fear, the majority of companies who use zinc oxide now use the larger, non-nano sized particles. If you are making your own skin care products and want to be on the safe side, make sure the zinc oxide you buy is non-nano zinc oxide.  (You can order uncoated, non-nano zinc oxide from us at MadeOn or in larger quantities at From Nature With Love.)
Is there any way that zinc oxide is NOT safe?
  •    It’s not safe to inhale.
  •    It may not be safe to consume.
  •    By itself it is not an allergen, but combined with other ingredients, you could react to something in the product. It could be irritating if rubbed into the eye.
  •    For best results, use sunscreen containing zinc oxide within a year as zinc oxide has a one year shelf life (unless otherwise noted on your purchased sunscreen).
  •   Too much of a sunscreen protection and you’ll keep out the needed UVB light needed to produce vitamin D.  You need to spend some time out in the sun with NO sunscreen.
Have you considered making your own sunscreen? It's easy! 

Resources:
http://breakingnews.ewg.org/2012sunscreen/sunscreens-exposed/sunscreens-exposed-9-surprising-truths/
http://www.badgerbalm.com/s-33-zinc-oxide-and-nanoparticles.aspx