The technology provides a multi-purpose dietary supplement that includes, in nutritionally effective amounts for humans, an orally ingestible combination of antioxidants, naturally-occurring substances and extracts of naturally-occurring substances. The naturally-occurring substances and extracts of naturally-occurring substances include at least: finely divided silica hydride a polyphenol ginkgo biloba leaf extract rhodiola rosea root bacopa monniera extract a glutathione precursor a phytoalexin a bioflavonoids CoQ10 and a phospholipid.