When the skin is exposed to UV-B light, cholesterol in the skin is transformed into vitamin D3. In general the skin does not need much UV-B energy to generate vitamin D3, and 15 minutes of strong sunshine every day is usually considered enough.
Best Answer: These are all types of drugs in one form or another. Hallucinogen is an umbrella term, meaning this includes both stimulants and depressants but mainly depressants.A hallucinogen is a drug that causes hallucinations. Examples include LSD and different types of mushrooms.llegal stimulants include meth(amphetamine)s, cocaine, crack, ecstasy. A depressant is a drug that overrelaxes your body, you are less aware and more susceptible to others' influence. Your heart rate and BP slow down, and you can lack coordination.
Stimulant. Stimulants are psychoactive drugs which induce temporary improvements in either mental or physical functions or both. Examples of these kinds of effects may include enhanced alertness, wakefulness, and locomotion, among others.