There are two forms of vitamin D in the body – D2 and D3: their empirical chemical formulae differ by a single carbon atom. We get them from different sources: D2 is found primarily in plant-based foods, while D3 is obtained from animal-origin foods, and is also produced when our skin is exposed to the sun’s rays.
Vitamin D3, or cholecalciferol, is synthesised from a sterol (complex lipid) called 7-dehydrocholesterol, naturally present in the body. When this sterol is exposed to the sun’s UVB rays, it is converted into vitamin D. Most of the vitamin D circulating in the body is produced in this way (1). That’s why we’re advised to expose our skin as much as possible to natural light. Vitamin D3 is also obtained from the diet, in particular from oily fish and egg yolk.
Vitamin D2 is a derivative of ergosterol, a sterol naturally present in the cell membranes of certain plants and fungi. Vitamin D2 is obtained by exposing ergosterol to the sun’s UVB rays. It is found in mushrooms (especially those exposed to UVB rays) as well as in vitamin D-fortified foods like margarine.
Vitamins D2 and D3 are both metabolized in the liver and then converted in the kidneys into the active and usable form of vitamin D (2). However, research has shown that vitamin D3 increases the level of the active and usable form of vitamin D in the body to a greater degree (3). It is also less sensitive to heat and humidity than D2 and thus more stable (4).
As a consequence, if you wish to take a vitamin D supplement, vitamin D3 is the better choice. You have three options to choose from:
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3 Days
The address correction app put in the incorrect address and I missed it when I hit the accept option. I noticed it when the order was already in route and called customer service to request that they change it to the correct address as the shipper and they were right on top of it. They called me back right away and changed the address. They sent a new email with the tracking information and called me to let me know it was all taken care of. Really happy with the product and customer service.
B Ball
3 Days
Fast service good products.
PERCY
9 Days
GREAT HONEST COMPANY!! FAST SERVICE!
HENDERSON B.
11 Days
EVERYTHING!! NO ISSUES!
DOMINIC
12 Days
The service has been good. However, the telephone and email responses were better before. Most of the products are great. Returns are processed promptly, and I do believe this is an honest and caring company. I plan to continue to buy your products.
DANIEL FORD
15 Days
My order arrived when promised in the condition described
Lisa
24 Days
10/13/24 Y ou were a bit slow to respond, but still helpful.
David Rolston
29 Days
I received wehat I ordered in a tiomely fashion. Great job to the whole staff 👏
Monica P
30 Days
Pomises products that work.Fast shipping. Will recommend to family and friends.
NEW Virginia
30 Days
Excellent product. Timely delivery. Only had one issue over the last few years. Great. Thanks
LEGG Jennifer
34 Days
I trust this company and product as I tolerate the bacillus coagulans very well and feel better overall when I am taking it . Thank you for offerring this product as a company . And thank you for an easy ordering process.
Barbara J
34 Days
Always fast & quick service/delivery. Top products
Brett
37 Days
The peanut sugar free one was very rancid tasting… the nuts were old. Everything else was amazing
MOORE Jennifer
39 Days
I purchase hyaluronic acid from Super Smart because it's the highest Dalton rating I could find. Shipping could be a day or two faster.
Kathy
43 Days
Fast shipping; availability of products.
Paul