Ah, IM Cosmofer tu untuk iron supplement kan? Honestly, some of my mum friends did complain about feeling a bit achy or lethargic when they first started it, especially if their iron was really low, the body's adjusting to the supplement lah. Tapi the side effects usually settle down after a few days once your body gets used to it. Kalau the aches really bothering you or it's been more than a week, better check with your doctor or midwife to make sure it's just the supplement and not something else, especially if you're pregnant or breastfeeding.