Dark circles under the eyes are known to be signs of stress, lack of sleep, fatigue, dehydration, allergies, fluid retention, genetics etc.
Also, as we age, our skin and the fat pad under the eyes becomes thinner, causing blood vessels to become noticeable. This gives the appearance of dark circles. Vitamin C can help to strengthen blood vessel walls.
Remember to wear sunscreen with a minimum of SPF 30 under the eyes to prevent skin weakening caused by sun damage.
The best remedies for reducing dark circles would be by getting plenty of sleep, rest, increasing your water intake to at least 8 glasses of water a day and last but not least eating a well-balanced diet.
Certain foods, such as cranberries, blueberries, bilberries, tea (green and black), black currant, onions, legumes, and parsley contain antioxidant pigments which may help to strengthen blood vessels.
Be careful not to consume too much dietary salt.
There are some home remedies that may help to diminish the appearance of dark circles under the eyes, and prevent dark circles from worsening.
Sometimes applying natural products like cooled tea bags and sliced cucumbers can help reduce the puffiness.
Chamomile is an anti-inflammatory that can also help to reduce swelling and puffiness.
For a temporary cover use a concealer:
If your circles are recessed, choose one that is one shade lighter than your foundation. If they are puffy, use one shade darker.
Yellow concealers are good for covering up bluish or greyish circles, if your circles tend to be in the shade range of red, look for an olive-based concealer while a blue-based concealer can mask brown eye circles.