Abstract: An absorbable prophylactic composition for protecting against ionizing or nonionizing electromagnetic waves. The composition is derived from a crude extract of residual fractions of crushed grapes, and primarily from solid material comprising pips, stalks and skins of grapes and/or combinations thereof. The crude extract is obtained by first pulverizing the fraction or fractions from the grapes to form a powder, and then subjecting the powder to at least two extraction processes, one with acetone and the other with ethyl acetate. The extract is then ingested in doses between about 20 mg to 3 g for an adult male. Tests have demonstrated the efficacy of this composition against changes induced by ionizing radiation (x-rays) and nonionizing radiation (UV-C).