Consider using Skinceutical CE ferulic which has been shown to be photoprotective (SPF8+ I think)
Photodermatol Photoimmunol Photomed. 2008 Apr;24(2):61-6.Click here to read Links
Topical isoflavones provide effective photoprotection to skin.
Lin JY, Tournas JA, Burch JA, Monteiro-Riviere NA, Zielinski J.
Chang Gung Memorial Hospital, Chang Gung University College of Medicine, Taipei, Taiwan. lindajylin@adm.cgmh.org.tw
BACKGROUND/PURPOSE: Isoflavones, one main group of phytoestrogens, have antioxidative and photoprotective effects in cellular and mouse studies. The aim of this study is to obtain a more comprehensive understanding of the isoflavone-mediated photoprotection with the pig skin model, a more human-resembling model. METHODS: The pig skin was treated with five well-known isoflavone compounds (genistein, equol, daidzein, biochanin A, and formononetin) and one antioxidant combination solution of 15% vitamin C and 1% vitamin E and 0.5% ferulic acid (CEF) daily for 4 days. Skin was irradiated with solar-simulated UV irradiation, 1 to 5 minimal erythema dose (MED) at 1-MED intervals. Evaluation was carried out 24 h later by colorimeter-measured erythema and sunburn cell numbers. RESULTS: Topical application of 0.5% solutions of three individual phytoestrogens - genistein, daidzein, biochanin A - are better than similar solutions of equol or formononetin in protecting pig skin from solar-simulated ultraviolet (SSUV)-induced photodamage, as measured by sunburn cell formation and/or erythema. However, the protection was less than that provided by a topical combination antioxidant standard containing 15% L-ascorbic acid, 1%alpha-tocopherol, and 0.5% ferulic acid. CONCLUSION: Isoflavones provide effective photoprotection and are good candidate ingredients for protection against ultraviolet (UV) photodamage.
the product used in the above study was skinceuticals CE Ferulic
Additionally, consider supplementing with Heliocare. Heliocare contains am extract from fern called Polypodium Leucotomos. Polypodium Leucotomos Extract has also been shown to be photoprotective
Drugs Today (Barc). 2007 Jul;43(7):475-85.Click here to read Links
Polypodium leucotomos extract: a nutraceutical with photoprotective properties.
Gonzalez S, Alonso-Lebrero JL, Del Rio R, Jaen P.
Dermatology Service, Memorial Sloan-Kettering Cancer Center, New York, NY 10022, USA. gonzals6@mskcc.org
Ultraviolet (UV) irradiation causes multifaceted damage to the skin and adjacent tissue layers, and is one of the leading causes of premature skin aging, immunosuppression and carcinogenesis. Photoprotection can be achieved by the use of sunscreens and also by systemically administered compounds that fight the deleterious biological effects of UV exposure, or preferably both. In this review, we summarize the current knowledge on the tissue, cellular and molecular mechanisms underlying the photoprotective effect of Polypodium leucotomos fern extract. P. leucotomos blocked the deleterious effect of UV irradiation both in vivo and in vitro. The molecular basis of photoprotection relies on its ability to inhibit free radical generation, prevent photodecomposition of both endogenous photoprotective molecules and DNA, and prevent UV-induced cell death. Its complete loss of toxicity combined with its multifactor protection makes it a valuable tool not only for direct photoprotection, but also as an efficacious adjuvant to phototherapy of various skin diseases.
Use both of the above whilst applying (and reapplying) a sunscreen that blocks out UVA&B then you'll be less likely to burn compared to someone who isn't using the above.
best solution though is to stay out of the sun as much as possible. Wear a broad rimmed hat and try to cover up with clothing that is sun protective.