Hmm, pening after taking folic acid or vitamins macam Obimin memang boleh happen, tapi kena check if it's the vitamin itself or maybe you're taking it on an empty stomach, a few of my mum friends had the same issue and it went away after they makan makanan dulu before taking it. Best check with your doctor or pharmacist though, sebab sometimes it could be something else or maybe the dosage perlu adjust, especially if you're pregnant or planning to conceive.