I don't know how to advise on Spain and Vitamin D. You should research that. We are at 41 degrees latitude and I just increased my Vit D to 6-7000IU daily. I was taking 5-6000IU. My 25-hydroxy Vit D level is 75 which is awesome. My doctor is captured by Big Pharma though and told me to stop supplementing again this year. I ignore her. My pharmacist who I trust, wants everyone at 70-80. I'm happy to pay what my insurance won't cover to know my level. Isn't it stupid though that Vit D is so foundational to one's immune system that health insurance companies won't pay for the test??!! It's because our US health system is all about SICKNESS, not WELLNESS. Okay, I'm starting to rant....but I just looked at a world map and Madrid is about the same latitude - 41, so you should be supplementing through the winter months at least. I hope that helps! 🙏