All the referenced studies (none of them are behind a paywall): The Beta-Carotene and Retinol Efficacy Trial: incidence of lung cancer and cardiovascular disea

All the referenced studies (none of them are behind a paywall): The Beta-Carotene and Retinol Efficacy Trial: incidence of lung cancer and cardiovascular disease mortality during 6-year follow-up after stopping beta-carotene and retinol supplements. http://www.ncbi.nlm.nih.gov/pubmed/15572756 http://www.ncbi.nlm.nih.gov/pubmed/15572756 Antioxidant supplements for prevention of gastrointestinal cancers: a systematic review and meta-analysis. http://www.ncbi.nlm.nih.gov/pubmed/15464182 http://www.ncbi.nlm.nih.gov/pubmed/15464182 Meta-analysis: high-dosage vitamin E supplementation may increase all-cause mortality http://www.ncbi.nlm.nih.gov/pubmed/15537682 http://www.ncbi.nlm.nih.gov/pubmed/15537682 Effects of long-term vitamin E supplementation on cardiovascular events and cancer: a randomized controlled trial. http://www.ncbi.nlm.nih.gov/pubmed/15769967 http://www.ncbi.nlm.nih.gov/pubmed/15769967 Multivitamin use and risk of prostate cancer in the National Institutes of Health-AARP Diet and Health Study. http://www.ncbi.nlm.nih.gov/pubmed/17505071 http://www.ncbi.nlm.nih.gov/pubmed/17505071 Antioxidant supplements for prevention of mortality in healthy participants and patients with various diseases. http://www.ncbi.nlm.nih.gov/pubmed/18425980 http://www.ncbi.nlm.nih.gov/pubmed/18425980 Dietary supplements and mortality rate in older women: the Iowa Women's Health Study http://www.ncbi.nlm.nih.gov/pubmed/21987192 http://www.ncbi.nlm.nih.gov/pubmed/21987192 Effect of Hypericum perforatum (St John's Wort) in Major Depressive Disorder A Randomized Controlled Trial http://jama.jamanetwork.com/article.aspx?articleid=194814 http://jama.jamanetwork.com/article.aspx?articleid=194814