Ergocalciferol is actually a form of Vitamin D, not the other way around.
"Steroid" is just a term denoting a terpenoid lipid with four fused carbon rings. There is a subfamily of steroids known as "secosteroids" that just have 3 fused rings and one broken ring. Vitamin D falls into this...
The word steroid was coined to describe sterols, a family of organic molecules that includes cholesterol.
Does Havoc fall into the broad category of steroids-- that is, is it a terpenoid lipid with four fused rings? Yes. As previously mentioned, cholesterol and Vitamin D do as well.
Is it...
Did a 4 week cycle f RPN Havoc and Spectra Force furaguno. Ate like a beast during and trained 6 days a week. I used Gaspari Novedex as a PCT.
Gained 22 pounds during cycle, lost about 3 pounds after. Also, managed to cut about an inch of my waist (32" to 31") during the cycle.