I won't hide it, I haven't purchased the product yet as I am still researching. I was ready to buy the One-Per-Day from Life Extension, but before doing so, I decided to check out Solgar's solution since they are a well-known company in the field.
Looking at the ingredients of the product listed on their official website - https://www.solgar.gr/product/polybitamini-vm-2000tm-tablets - I am surprised when a well-known multivitamin like this one has mistakes like the following.
"Vitamin D2 (400IU, as ergocalciferol)"
1) D2 is the plant version of vitamin D, which has only 10% absorption compared to D3. D3 is the animal form of the vitamin found in meat. With a quick search, we can confirm this.
"D3 is approximately 87% more potent in raising and maintaining serum 25(OH)D concentrations and produces 2- to 3-fold greater storage of vitamin D than does equimolar D2."
2) Then it only has 400IU when - again with a search - we can find from the NIH (National Institute of Health) of America that an adult can and should take 800 to 2000IU of D3 per day. "The recommended dose for neonates and infants is 400–600 IU/day, for children and adolescents 600–1000 IU/day and for adults 800–2000 IU/day [57].Mar 16, 2023"
What's the point of having 400x2 of D2 (800) when they have ~10% absorption compared to D3? It's like taking 80IU, while the NIH tells you to take 800 to 2000IU, and recently there have been studies saying that 5000IU of D3 per day is perfectly fine without any risk.
I understand that it's a multivitamin and it can't have everything, but just from this example, it suggests to me that something similar will apply to the other substances when they discount D, which is not only a vitamin but also a hormone.
Compared to the One per Day from Life Extension, there is a big difference. It's 1 per day and provides 50mcg, which is 2000IU of D3, not D2. Obviously, it also has other substances that play a role, but I give importance to this as it is crucial for the average Greek who suffers from vitamin D deficiency as the statistics indicate, even though we are a country with plenty of sunlight.