Asprin is not needed.
Aspirin is used i nthe tradionnal eca stack but it does not necessarily increase the thermogenic effect of ec... I would start with 25mg of E & 100mg of C per day for the first week, then increase to 50 & 200 for weeks 2-3, week 4, 5, 6 go to 100 & 200, then week 7, 50 & 100, week 8, 25 & 100, end wait 4-5 weeks then repeat