Yes, you should capitalize "About" in a title.
You should avoid too much niacin when you have gout as the niacin competes with the means the body has for eliminating uric acid,
Yes, you should capitalize the C in Century.
No, you should not. You should only capitalize a word when it is at the start of a sentence or when it is a proper noun.
None. It doesn't work and taking an OD of niacin is dangerous.
Niacin is a type of Vitamin B that is water-soluble. For children ages 9 to 10 years old, they should have one gram of niacin three times a day.
Yes, you should capitalize "The Rotunda" as it is a specific place or location.
You should capitalize Colosseum when referring to the specific ancient Roman amphitheater in Rome.
no
No
No
It should not be capitalized.