 What makes your FastMelt D3 formula a much better choice? Well, Chris, first of all, I put 5,000 units of vitamin D3 per serving in each tablet, so you can actually feel the difference. Second, I use the right type of vitamin D in my formula. And third, I've worked with an advanced team of scientists, and they're using this technology to put it in this Fast Dissolving Melt for immediate absorption and quick results that you can feel.