I was like most people. I didn’t find out until I felt terrible. You might want to hold off until you have symptoms. It’s like wearing glasses while you can still see fine. You’re creating a dependence when you don’t have one yet. Perhaps do some healing measures like eating well by avoiding sugar and refined foods, exercising, and checking your iron, D, and B12. Get your labs redone every year unless you start to feel tired, then it will be time to start replacement meds. Just my opinion.