"I haven’t gotten my levels checked but assume it is potent. When it comes to cost: this has 600 servings for $27. This might be the most affordable yet high quality D supplement on the market. Other supplements are usually just a one month supply, this can last a year with two drops/day. As for the dropper, you simply turn the bottle upside down and wait a few seconds for a perfectly sized drop."

"EDIT: OKAY after a few days - the dispenser is not bad at all. It's just different, but it works perfectly and I'll even say that it's BETTER than the standard dropper. Just turn the bottle upside down and let it drip, one perfect drip at a time, not too fast or slow. Just one simple step.

I'm tempted to squeeze/shake/tap it for an INSTANT drop, just as others may agree, but there's no need for it. Maybe it's our habit to instantly squeeze a dropper that makes this dispenser an annoyance. But it works just fine.

I don't write reviews often but I can't believe I wrote a review on a dropper then had a complete change of mind. I am at peace. I will not judge things quickly if my expectations are not instantly met. Thank you for reading.

ORIGINAL REVIEW: I just received this and can't comment on whether it works or not, but as the other comments suggested - this is the worst dispenser/dropper I've ever used. It's as though product development's goal was to make create a dropper that's extra difficult to use rather than stick with simplicity."

"I got this vitamin supplement on the recommendation of a nutritionist. She said not to take calcium but a D3 and K2 supplement and recommended this one by name. We get plenty of calcium in our diets, but what helps bones absorb it is the D3 and K2. I'm only giving it 4 stars because I think it's kind of costly, not buying calcium should somewhat offset the cost."