4Flex Active - Strawberry Flavour. 4Flex Active is a unique combination of FORTIGEL® collagen hydrolysate, vitamin C and L-carnitine, which occurs as a natural substance in our body. One sachet contains 7 g of collagen hydrolysate and 2 g of L-carnitine tartrate, which is 1.36 g of L-carnitine.
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