Hi! You can look at the question I posted a couple of weeks ago. Some of the researchers who answered my question provided articles regarding Vitamin D from plants. I hope it could help you more than it helped me. Regards!

https://www.researchgate.net/post/Is_it_possible_to_extract_Cholecalciferol_Vitamin_D3_from_plants

Vitanim D occurs mainly in two forms namely cholecalciferol (vitamin D3) and ergocalciferol (vitamin D2). Vitamin D3 (cholecalciferol) is produced through the action of ultraviolet irradiation (UV) on its precursor 7-dehydrocholesterol. Human skin makes vitamin D3 and supplies about 90 % of vitamin D. Vitamin D2 is a derivative of ergosterol, a membrane sterol named for the ergot fungus, which is produced by some kinds of phytoplankton, invertebrates, yeasts, and higher fungi such as mushrooms. Sterols also play an important role as precursors of many steroid hormones including vitamin D. Vitamin D supplements and additives come in two forms: ergocalciferol, or vitamin D-2, and cholecalciferol, or vitamin D-3. Vitamin D-2 is derived from plant sources. Avocado fruit, seeds of sunflower, flax, pumpkin, alfalfa (Medicago sativa) and wild salmon are report to contain a little of Vit.-D. For further details following link may be consulted.-

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3651966/

@ Jovale Vincent Tongco, Kamal Bani-Hani, YOGESH TRIPATHI, Aria Tsam

Thank you all for giving valuable suggestions and references..

@ Kamal Bani-Hani,

Sir, Thank you so much for respect, but let me clear that I am too young to be called "Dr". Sir, compare to you I am just little boy.

My PhD is pursuing in the field of phytochemistry.

Please see my answer to the post:

https://www.researchgate.net/post/Is_it_possible_to_extract_Cholecalciferol_Vitamin_D3_from_plants

The most common plant source of cholecalciferol is Medicago sativa subsp. sativa. Contains 4.8 μg (192 IU) vitamin D2, 0.1 μg (4 IU) vitamin D3 (per 100 g)