Those of you who work indoors in the winter, in other words, who don't see the sun, absolutely need it from November to April.

My doctor recommended it to me because of a vitamin deficiency. After 1 month of use, I repeated the blood tests and the vitamin D levels had risen to normal levels.

My doctor recommended it because of a deficiency shown in my blood tests. From the first capsule, I started getting a severe headache that wouldn’t go away with any painkiller. After 5 days of continuous use, and since I had nothing pathological that could explain the headaches, I stopped it and they stopped dead. Maybe the 4000 IU was too much. I’ll try the 1000 IU to see what happens.
And with the 1000 IU, after taking it for 2-3 days, the same thing. The doctor: I’ve never heard of that. Well, doctor, read a paper.

If it doesn't have K2, it does nothing.
So it does nothing.
Not that I saw any difference with a 5000 and K2 that I've been taking for 2-3 months now, but just saying.

I don't know if it is related to taking it systematically during periods when I don't get sunlight, but now I rarely get sick. As a capsule, it is small, it hasn't caused me any problems and it is in oil (it looks like a smaller Omega-3 capsule) for better absorption.
I consider it an excellent choice, regardless of its price, which is lower than many others.

I have been taking this vitamin for years and it definitely works because all the tests I do come out very good. I had been diagnosed with a deficiency and an endocrinologist had recommended vitamin D3 from a Greek company. At some point, I preferred this one from Lamberts because I like its form, which is a small capsule and is swallowed very easily.

I use it in cycles, alternating it with other supplements. Vitamin D (in my case I use 1000 mg twice a week) helps with many functions.

I take D3 due to osteopenia and asthma. I decided to try another company's product because of the low cost, but you get what you pay for. After 1 week of taking it, I started having a cough and pain in my left hip. I didn't understand why, and for 2 months while I was taking this particular vitamin, the pain in my left hip continued and I was using Aerolin. I thought that the only change I made was the brand of D3. I stopped it, went back to Lambert, which is indeed twice the price, but the hip pain stopped, and so did the need for Aerolin.