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From http://www.homeremediesweb.com/age_spots_home_remedy.php

Home Remedies and Natural Cures for Age Spots Treatment
Age Spots Home Remedy Using Apple Cider Vinegar
When Apple Cider Vinegar is mixed with onion juice and applied directly to the skin, it can help you to get rid of age spots and sun spots.
Finely chop or blend an onion, and use a strainer or cheese cloth to squeeze and extract the juice.
Take one part of Apple Cider Vinegar and one part of onion juice and mix them together.
Dab a cotton pad into the solution and apply it directly onto the age spots.
Leave this on the skin for a minimum of 30 minutes, and as long as you are comfortable with it. Repeat this once a day for approximately 6 weeks and you should begin to notice a gradual improvement. If the spots have not completely disappeared after the 6 weeks but they have started to fade, keep repeating the process until they do.

To speed up the process, you can mix 3 tablespoons of Apple Cider Vinegar into a mug full of water (hot or cold), and drink this twice daily for a month. This will not only improve your age spots, but it will also give you a healthy young glow and make you feel energized and active. If you find the taste of the vineger to be too strong, try adding a tablespoon of honey as a natural sweetener.

Natural Cure for Age Spots Using Aloe Vera
Aloe Vera juice or gel has long been known as a general healing agent for skin problems, particularly burns. Many people have also found it to be helpful in reducing the visual appearance of age spots. Simply rub the juice or gel directly onto the affected areas twice a day, and leave it on the skin for at least 45 minutes each time. Within a month you should begin to notice improvements.

Home Remedy for Age Spots Using Lemon Juice
The acid in Lemon juice has been shown to help fade the appearance of age spots. Simply dab fresh lemon juice directly onto the spots twice daily and you should begin to notice improvements in about two months. Leave the juice on the skin for at least 30 minutes, or as long as you are comfortable with it. You can also leave the juice on the skin overnight.

NOTE: If you plan to go outdoors, wait for the juice to dry as it increases the skin's sensitivity to sunlight.

Using Castor Oil as a Remedy for Age Spots
Castor Oil has been shown to improve the appearance of age spots. Simple rub the oil directly onto the affected skin areas once in the morning and once in the evening. This should help fade the spots within a month.

Try these home remedies for reducing dark spots.

• Applying a mixture of cucumber juice, potato juice and tomato juice is one of the most effective natural home remedies for getting fair. These juices can be applied individually too. Thin slices of potato can also be applied on skin to lighten darkened skin.

• A combination of lemon juice, tomato juice and cucumber juice mixed in sandalwood powder serves as an excellent natural treatment for Dark Skin.

• Make a paste of dried and powdered orange peels and milk. Regularly applying this natural bleach for about 20 to 25 minutes per day is one of the most widely used natural home remedies for Dark Skin. Simply applying orange or tangerine juice is also beneficial.