High-strength friendly bacteria for everyday use for adults ? the ProVen Probiotics flagship product 25 billion multi-strain research-backed ProVen Probiotics per two capsules. Supported by a large number of clinical trials, the first undertaken in 2004. Proven to survive stomach and bile acids With vitamins C & D, zinc and selenium to support immunity and calcium to support digestion. 1-2 capsules a day, depending on need