I received a prescription after a Vitamin D deficiency was discovered at Yeongdeungpo Apple OB/GYN.

I visited Apple OB/GYN in Yeongdeungpo. I went last November because I hadn't had my period, and the director suggested an ultrasound and blood test. The blood test results revealed that I was deficient in Vitamin D. While that probably isn't the cause of my missed period, I was a bit surprised by the unexpected result. The director advised that since my Vitamin D levels would likely continue to drop, it would be best to get injections every three months. I had forgotten about it until I remembered receiving a text message at the end of February, so I visited again today. They recommended taking inositol, saying it is good for irregular periods! Since it is a product from the OB/GYN, I'm not sure if it's sold in regular stores, but because the director recommended it, I think it's worth buying.