The bottle needs to have a measuring syringe rather than a cap. It is too difficult to use without a glass dropper.
Pure Encapsulations Vitamin D3 Liquid
Easy to measure
I have been using Pure D3 drops for 4 years. Under the doctor's care it raised my numbers from 21 which was critically low to 85. I continue to use them every day for maintenance. I think this product works really great and prefer it to capsules.