Garden Biology stated on the interactive platform: 

Ordinary VD3 needs to be converted into fully active VD3 (1α, 25-hydroxy VD3) through liver and kidney metabolism before it can be absorbed by humans and animals. 

25-hydroxy VD3 can bypass liver metabolism and be absorbed by humans and animals. As absorbed by animals, 25-hydroxy VD3, as the active metabolite of VD3, not only has all the functions of ordinary VD3, but also has other unique functions, and has a broad market prospect.