ESTUDIOS:
http://www.ingredients-insight.com/news/newsguzen-development-idevelops-new-vegan-mushroom-powder/
http://www.guzendevelopment.com/
http://www.vrg.org/blog/2012/02/13/mushroom-powder-supplies-vegan-vitamin-d/
http://www.crankyfitness.com/2011/11/vitamin-d-packed-mushroom-powder-and.html
http://www.dole.com/mushroompowder/pdf/DNI%20Portobello%20Mushroom%20Powder.pdf