Which B vitamin is for energy?
Several contribute to the reduction of tiredness and fatigue - B2, B3, B5, B6, B12 and folate among them. A B-complex covers the group, which is usually more sensible than picking one.
Should I take iron if I am tired?
Get a blood test first. Iron is a common cause of tiredness but too much iron causes its own problems, and your GP can settle it quickly.
Do B vitamins make urine bright yellow?
Yes - riboflavin (B2) is naturally fluorescent yellow and what you do not absorb is passed out. It is entirely harmless and not a sign of waste.
When should I take them?
Morning suits most people, and with food is gentler on the stomach. Some find B vitamins keep them awake if taken late in the day.