Hi i wondered if anyone can give me advice on some vitamins....i went into Holland and Barrett yesterday as i want to up my vitamins as my normal multivit isnt helping me in the slightest...so i purchased

time release B100 (B complex)
EPA fish oil conc 1000mg (jar says 1-3 a day) how many should i take?
calcium and magnesium supplement

The woman in the shop said i could take my normal multi with all these..im worried now though as im thinking the B100 vitamins are a too high dose...does anyone else take this dose??