useful, valuable
colour/color (= a magazine that comes with a newspaper), magazine, newspaper, online, special, Sunday (esp. BrE), weekend
Our special supplement is packed with ideas for healthy hair.

16-page, 20-page, etc.
diet, dietary, food, herbal, natural, nutritional
daily
women who take a daily supplement of folic acid

mineral, protein, vitamin, etc.

provide (sb/sth with)
add
The farmer adds a supplement to the horse's feed.

take, use (sth as)
I take a vitamin supplement every day.
You can use these books as supplements to the basic English course.

supplement to
This document is a supplement to the main report.

additional, extra
$100, £50, etc.
A single cabin is available for a £20 supplement.

flight, single-room (both esp. BrE)
If you want to travel on a different day, a flight supplement is payable.

means-tested (BrE)
means-tested supplements to the basic pension

add, charge
We charge a small supplement for this service.

carry (esp. BrE), have
Weekend flights carry a supplement.

pay

be payable

at a supplement
Single rooms are available at a supplement.

supplement for
a €20 supplement for each extra night

supplement on
There is a supplement on rooms with a sea view.