My cardiologist recommended the 50,000 iu of vitamin D weekly I believe for 8 weeks. I have concerns about that dosage. I have tried to take D3 vitamin which you recommend over D2 but it causes similar stimulation to caffein in coffee which I can not tolerate. When taking D3 and I believe was only 5000 iu daily could not sleep at night because had similar effect as drinking two cups coffee before going to bed. How to take vitamin D as we are certain we are deficient BUT if we can not tolerate 5000 iu of d3 how are we going to be able to take 50,000 iu of d2 ? They also prescribed capsule so we can not reduce dosage possible by breaking a pill. I have a hyper sensitivity to any type of stimulants like caffein or even lots of sweets before bedtime . Thank you . In our 60's .