this is the strongest b complex that is available in the uk & we recommend this product is best taken for short periods of 2-3 months during periods of convalescence or as a quick boost to your b vitamin intake. after this period you should change to our b 50 complex our multi b complex or choose one of our multis such as multiguard® which have high b vitamin levels.if you are wondering if a b complex is what you need then this product will leave you in no doubt (although the same could be said for our b 50 complex) which is why nutritionists sometimes recommend a product of this strength.as with all our products these tablets are made in the uk to strict gmp pharmaceutical standards using the highest quality b vitamins available.uk’s strongestsafe for short term usehighest qualitypharmaceutical grade vitaminsuk made gmp standardsone-a-day coated tablets