The correlation between excess and appearance when it comes to beauty is pretty clear: chain-smoke and pay for it with damaged skin and stained teeth (or something far more deadly); sunbake and get wrinkles and sun spot (ditto on the deadly bit). But what I've never understood is how you
Everything you need to get the best from your concealer
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Everything you need to conceal those dark circles. Photo / Getty Images
THREE CONCEALERS TO TRY:

1. Australis BrightEyes Illuminating Under Eye Concealer ($15). Well-priced and silky, this eye-brightener comes in two shades - Banana, which is good for banishing correcting redness, and Musk, a salmon-pink option best for bluish-grey circles.
2. If you're a fan of the mineral - or natural - option, try Jane Iredale's Active Light Under-Eye Concealer ($54.65). It isn't cheap but it does boast 10 under-eye benefits - hydration, dark circles, puffiness, radiance, fine lines and wrinkles, texture, skin tone, age spots, clarity and soothing - and also comes in six shades.
3. Well regarded for its longevity, Revlon's ColorStay Under Eye Concealer ($28.50) is a lightweight product with plant extracts that nourish and protect the skin.
Read the label: Caffeine
Why look for it: Used in everything from body scrubs and anti-cellulite creams (don't expect miracles) to high-end face creams and hydrating spritzes, caffeine is a common ingredient in skincare.
How it works: Caffeine helps blood flow to the skin as well as working as a diuretic, hence its inclusion in skin-firming creams and those designed to reduce puffiness under the eyes. It's also an antioxidant, which is why it's often found in anti-ageing products.

Find it in: Elizabeth Arden Flawless Finish Everyday Perfection Bouncy Makeup ($79), Clarins Instant Concealer ($50), and Trilogy Firming Body Lotion ($30).