Husband and I started to wear Vit D3 patches during covid on advice of paramedic daughter. Through listening to experts stating better to take it with K2 supplement to get full absorption rate of calcium. So a combined patch is ideal. Husband diabetic after recent check up his sugars were much better, and so were mine. I've now read up, this can happen with regular does of Vit. D. Keep up the good work.🤗