What Causes Very Light Periods?

hi, i am 37 years old, since one year my period is very light, my cycling is 27 days, day 1- i get little spots, after that theres nothing, no bleeding at all, someone said to me livogen z folci m12 tablet will help your period get heavier, i have started putting weight, could you please help me , what would you recommed? my gp and other doctors, consultants have done all the tests, the tests seem normal, they also said i have no menapose.