the fibrils of e g mfc the alkaline earth carbonate is thus according to one embodiment as such not added to the suspension comprising the nanofibrillated polysaccharide instead precursors of the alkaline earth carbonate is added such as for instance carbon dioxide and milk of lime or carbon dioxide and magnesium hydroxide mg oh 2 the composite formed between the alkaline earth carbonate and the nanofibrillated polysaccharide may further contain other substances such as stabilizing chemicals such as polyphosphate polyacrylate polyacrylic dispersants different types of surfactants such as sds sdbs ctab etc the composite might also containing compounding or coupling chemicals such maleic anhydride functionalized chemicals acrylic co polymers acrylic acids as needed when mixing with plastics the composite might also contain other functional additives such as optical brighteners lubricants primers absorbents dyes and charge controlling agents the said composite might also contain other fillers or synthetic polymers providing e g improved barrier properties or e g thermoplasticity according to an alternative embodiment the fcc or precipitated alkaline earth carbonate is formed in a traditional off line method such as a batch or continuous process and brought into contact with the mfc anywhere in the paper making process trough conventional methods such as those disclosed in ep2287398 where calcium carbonate particles are introduced into a suspension comprising cellulosic or starch fibrils where the calcium carbonate particles have a.