. >> reporter: an alabama mom named tawny willoughby is the woman behind this shock the skin cancer selfie now spreading on social media. the 27-year-old nurse hoping this graphic photo shared more than 60,000 times acts as a wake-up call. this is what skin cancer treatment can look like. wear sunscreen, and get a spray tan. willoughby has been diagnosed with six carcinomas, a common skin canner that can require painful treatments to remove. now, though, a new study finds taking a simple vitamin can help prevent those cancers. >> it's very exciting and it's very promising. >> reporter: dermatologists like tanya are buzzing about the australian research that shows people diagnosed with basal or squamous cell carcinoma who took a form of vitamin b3 twice a day were 23% less likely to get the cancer again. >> you still have to do all the important things for skin cancer prevention. you can't just take b3 and bake in the sun and expect not to against skin cancer. >> reporter: vitamin no subs kite for sunscreen. "consumer reports" is now out with its 17 summer picks, some as expensive at $9 a b

willoughby has been diagnosed with six carcinomas, can require painful treatments to remove. now, though, a new study finds taking a simple vitamin can help prevent those cancers. >> it's very exciting and it's very promising. >> reporter: dermatologists like tanya are buzzing about the australian research that shows people diagnosed with basal or squamous cell carcinoma who took b3 twice a day were 23% less likely to get the cancer again. >> you still have to do all the important things for skin cancer prevention. you can't just take b3 and bake in the sun and not expect to get skin cancer. >> reporter: consumer reports is out with its 17 summer picks. some as inexpensive as nine bucks a bottle like walmart's equate spf 50. >> the best performing sunscreen in our test was one of the most expensive ones. but there were plenty that were $2 an ounce or less. >> reporter: and here's how much you need to be protected. "consumer reports" recommends about a teaspoon of sunscreen on each part of your body exposed to the sun. halle jackson, nbc news, los angeles. >>> we're back in a

in a recent facebook post to raise awareness of the dangers of tanning, tawny willoughby of tanning,y willoughby shows facial scars after being treated for the same kind of skin cancer as breslow had. a new australian study followed 386 patients with two previous bouts of non-melanoma skin cancer. one group was administered a vitamin called nicotinamide for one year, the other a placebo, the group taking the vitamin had a 23% reduction in skin cancer recurrence. dr. jessica krant is breslow's dermatologist. >> i'm very excited about this study, but it looks like patients who have a history of many skin cancers will be able to take a regular vitamin from the drugstore and reduce their risk of getting future skin cancers. >> reporter: what good is it if it's not totally preventing the skin lesions. >> some patients have multiple skin cancers, up to 100 per year. for those patients to reduce by 25% the number of lesions they're having surgery for or having other treatments for is very significant. >> reporter: the nicotinamide may work by helping to repair the damaged d.n.a. that can le

willoughby be man who carries this label, or the young prince from jordan who represents a change.cuts on the way for bank of america. the chief executive says they will have to reduce costs and less revenues improve. goldman sachs anchors got the biggest bonuses in london this year. the average payout was 194,000 pounds. that is 24,000 pounds more than morgan stanley, which came in and second -- at second. manus: one country and southern europe will be the talking point at the g7. what country? greece of course. more after the break. ♪ >> with good spirit on both sides, and looking into a real of this that it would be for greece if this does not work out and this terrible you -- terribly risky situation for europe if this does not work out . i am hopeful that common ground will be found. caroline: that was larry summers speaking to hans nichols in an exclusive interview. let's get another opinion. we are joined by senior global economist. give us a sense of your perspective of -- how much you are factoring in the risk of a grexit right now. >> both sides definitely have an incenti