Improved formula. Fos-A-Dophilus now utilises GUARD technology; a patented, innovative and natural technology proven to protect the bacterial strains from stomach acid and enable the timed release of the probiotics within the intestines. It is a high potency, active probiotic supplement containing six strains of live probiotics, providing four billion bacteria per capsule. Contains specially cultivated strains which are stable at room temperature and active throughout the whole GI tract. Ideal for adults over the age of 40. Please note that this product now contains GUARD technology and the colour and weight of the ingredients are different from previous batches. The contents appear more clumpy on inspection, we can confirm that this is a normal characteristic of GUARD technology which utilises a very fine powder. This is the correct new formula and the potency of strain is the same - GUARD technology has reduced the prebiotic content and hence the smaller capsule and reduced content.