Premier Research LabsVitamin D3 Serum - Liquid Vitamin D Oil Drops for Adults, Liquid Vitamin D3 5000 IU, Sublingual Vit D3 Liquid - 0.43 fl oz

My chiropractor told me I needed to use this brand as I wasn't absorbing the brand I was taking. I am now in the high end of vitamin D3 levels. My MD is very pleased with my levels. So am I.

Clean formulation! The price is competetive as well. A few drops goes a long way to mitigate the moodiness of SAD in the PNW. The olive oil tastes high quality, with a peppery note that is pleasing to the palate.

A few years ago my vitamin D level was so long my doctor put me on prescription vitamin D pills for 3 months. He wanted me to continue taking them after my level came back to acceptable level but I don't care to take prescription medicines too much. I bought this and my levels continue to be great. My doctor was so impressed he wanted me to bring in the bottle. He thinks it's great also.

Works well, my levels went up with just one bottle. I’ll continue to keep using this brand! Taste just like olive oil, easy to get down. Ingredients are clean!

First I want to address the complaint listed in previous reviews about the drops coming out slow. It was a real pain until it dawned on me [duh!] to simply hold the bottle in my hand for a couple of minutes to warm it. Now it comes out fast and you have to pay attention.I was on dialysis and then had a kidney transplant. Vit D deficiency is common with this. I have labs done now every four months and Vit D, 25 Hydroxy is always checked. The UCLA labs range for it is Optimum Level: 30 - 80 ng/mL.I wanted my D to be in the higher area of the range. I am doing 3 drops in the morning (6,000 iu) and 2 drops in the evening (4,000 iu) and my 2-4-2013 lab result was 60.I would expect the supplemental dosage for a "normal" person would be lower, but nothing is better than monitoring what you are doing with lab results.Previously, I was doing the same dosage with Nature's Way 2,000 iu tablets. The PRL D3 Serum drops - now that I know to warm it first - is easier than taking an additional 3 & 2 tablets on top of the 6 & 6 (am & pm) anti-rejection pills I already take.The PRL D3 serum label says 375 servings (drops) at 2,000 iu each. I have not accurately tracked when I start and complete a bottle. That said the current Amazon costs for the PRL D3 serum is 12.95 and the Nature Made 220 tablet bottle is 11.99. Doing the math I get at my dosage costs of 5.18 for PRL versus 8.18 for Nature's Made. Even if the warming routine generates bigger drops or for some other reason the 375 drops per bottle is high, the cost is still less than Nature Made.

Great product but it got very expensive.

I use these drops which were originally given to me by my doctor, so I trust that they are higher quality than what I may have chosen for myself had I picked them up off the shelf. Ordering here is a much easier and less expensive way for me to get the best quality for a lesser price.

I have used this in the past & it works well for me. I am using it under the advice of my doctor, so I only take 2 drops instead of 5 so it will last longer in my case.