UVB photoprotection with antioxidants: effects of oral therapy with d-alpha-tocopherol and ascorbic acid on the minimal erythema dose.
Ultraviolet radiation absorption is responsible for the production of free radicals in damaged cells. This side effect may be neutralized using antioxidant substances. It has been reported that ascorbic acid and d-alpha-tocopherol scavenge reactive oxygen species. In a single-blind controlled clinical trial we studied 45 healthy volunteers divided into three groups. Group 1 received d-alpha-tocopherol 1,200 I.U. daily; Group 2 ascorbic acid 2 g daily and Group 3 ascorbic acid 2 g plus d-alpha-tocopherol 1,200 I.U. daily. Treatment was sustained for one week. Before and after treatment, the minimal erythema dose was determined in all participants. The results show that the median minimal erythema dose increased from 60 to 65 mJ/cm2 in Group 1 and from 50 to 70 mJ/cm2 in Group 3. No modifications were observed in Group 2. We conclude that d-alpha-tocopherol prescribed in combination with ascorbic acid produces the best photoprotective effect.
Mireles-Rocha
Homero
H
Hospital General de Zona y Medicina Familiar No. 1, Instituto Mexicano del Seguro Social, Colima, Col. miroch@prodigy.net.mx
Galindo
Ignacio
I
Huerta
Miguel
M
Trujillo-Hernández
Benjamín
B
Elizalde
Alejandro
A
Cortés-Franco
Roberto
R
D000284:Administration, Oral; D000293:Adolescent; D000328:Adult; D000975:Antioxidants / Q000008:administration & dosage*; D001205:Ascorbic Acid / Q000008:administration & dosage*; D004305:Dose-Response Relationship, Drug; D004334:Drug Administration Schedule; D005260:Female; D006801:Humans; D008297:Male; D011336:Probability; D011829:Radiation Dosage; D012016:Reference Values; D012039:Regional Blood Flow / Q000187:drug effects; D012680:Sensitivity and Specificity; D012869:Skin Absorption / Q000187:drug effects / Q000528:radiation effects; D018709:Statistics, Nonparametric; D013471:Sunburn / Q000517:prevention & control*; D014466:Ultraviolet Rays / Q000009:adverse effects*; D014810:Vitamin E / Q000008:administration & dosage*
D000975:Antioxidants; D014810:Vitamin E; D001205:Ascorbic Acid