The number of study participants who had hypertension were 22 and 19 having low and normal vitamin D2
level respectively (table 3).
In one study, 34 type II diabetics with low serum vitamin D levels (less than 20 ng/mL), were given 100,000 IU of vitamin D2
(ergocalciferol) or placebo, and monitored for eight weeks.
Their hydroxylated forms, 25-OH vitamin D2
and 25-OH vitamin D3 (calcifidiol) are the biologically active forms.
In humans, the most important related compounds of vitamin D are vitamin D2
(ergocalciferol) and vitamin D3 (cholecalciferol).
Furthermore, vitamin D3 supplementation has shown a more sustained peak that was still visible on day 14 when compared to vitamin D2
administered for the same length of time.
A subgroup analysis found that vitamin D3 was superior with a pooled relative risk reduction of 26% when compared to vitamin D2
(12% risk reduction).
Vitamin D is absorbed through the gut as either vitamin D2
(ergocalciferol) or vitamin D3 (cholecalciferol) .
isn't bad, but it is the vegetable form of the vitamin, and in order for our body to use it, we must convert it into vitamin D3, which is not an efficient conversion.
Data source: In the prospective, uncontrolled study, 46 women with type 2 diabetes, comorbid major depression and chronic pain, and vitamin D insufficiency received 50,000 IU/week of vitamin D2
for 6 months.
If you prefer to take only products that are 100% vegetarian, you'll need to take vitamin D2
for bone support.
Vitamin D3, or cholecalciferol, is much stronger and more active than vitamin D2
, or ergocalciferol.
Five forms of vitamin D have been discovered -- vitamin D1, D2, D3, D4, D5 but the most important ones are vitamin D2
and vitamin D3.