One is 2,000 units and the other is 50,000 units. So 25 of the first will equal the second. Just stick with the doctors prescription as written. 50,000 units is only until your level is back where it belongs. When that test comes back, you can use the smaller units to maintain your Vitamin D if the doctor agrees. It really depends where you live and how much sun you normally get each day. Always check with the doctor as too much is toxic and can harm you.
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