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.