to much of anything is not good, even sunscreen
http://www.aol.com/article/2015/07/21/will-sunscreen-give-me-a-vitamin-d-deficiency/21212050/?icid=maing-grid7%7Cmain5-lifestyle%7Cdl4%7Csec3_lnk4%26pLid%3D-812405417
http://www.aol.com/article/2015/07/21/will-sunscreen-give-me-a-vitamin-d-deficiency/21212050/?icid=maing-grid7%7Cmain5-lifestyle%7Cdl4%7Csec3_lnk4%26pLid%3D-812405417