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

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.

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.

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!

I'm completely happy with this product; purity, price, taste, # of servings. It is so much easier to take a drop or two under the tongue or in a smoothie than to have to swallow another tablet or capsule that has undesirable additives. This serum is also easy to apply to the skin and absorbs well - what a great way to get the amount of Vit D you need quickly and so easily.I keep my bottle with the dropper in the kitchen cabinet and take it or use it at breakfast.

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.

I chose this product because I wanted a vegan D3 supplement. I found that this is almost vegan, since it was made from bacteria and sheep wool extract (lanolin), at least it does not require the killing of the animal. It seems to be the closest to vegan of any D3 source. The effect is subtle for me. I seem to feel it working, but it is not as obvious as other supplements. My one reservation is the bottle. The thick serum does not pour well out of it. I ended up taking the dropper top off and pouring it directly. I have since found another near vegan D3 from another company that dilutes the formula so that it can be administered from a regular dropper bottle. This seems more practical for daily supplementation. It seems that we do need D3 and it may qualify as a mild global deficiency, perhaps due our species spending less time outdoors in a direct sunlight.

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.

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.