1) Basil Tea
A great natural remedy to get rid of lethargy is to make a homemade tea.  Use basil leaves to make this brew.  Another great way to cure lethargy is to make a fresh squeezed juice using lemons and grapefruit.  Not only does this juice concoction help with lethargy, it can also help restore a lagging appetite.

Citrus Juice

2) Food Allergies as Cause of Lethargy
Food allergies are one of the most common causes of lethargy.  The top ten allergens in order of the most allergic reactions to the least from top to bottom:  Dairy causes more allergic reactions than any other food.  Get dairy out of your diet for sure. 2. Eggs  3. Fish.  4. Peanuts.  5.  Tree nuts.  6.  Sesame.  7.  Shellfish.  8.  Soy.  9.  Wheat.  10.  Gluten (a protein found in wheat, barley, rye and some other grains).  Go on an elimination diet to find out what foods are causing you to feel lethargic.  Try to eat natural whole foods.

3) Citrus Juice Lethargy Cure
Lethargy can be naturally cured using fresh citrus juices.  Try lime and orange juice to improve the lethargic feeling and to improve your blood circulation.
 
4) Coffee Cure
While some people find caffeine to be bothersome and to cause a crash later in the day, some people find that using natural forms of caffeine (meaning coffee and tea in moderate amounts – NOT the sugary, calorie and chemically dense energy drinks sold at convenience stores) helps to quickly eliminate lethargy naturally.
 
5) Massage as Lethargy Home Cure
One of the best home remedies and cures for lethargy is massage therapy.  Try using essential oils like eucalyptus and rosemary to improve circulation and get your energy going.
 
6) Essential Oils
You may also find that essential oils are great natural stress relievers.  If you have too much stress in your life, you will likely find that you'll be suffering from lethargy and low energy levels.  Try taking a hot bath and add a few drops of some essential oils to the bath water.  Citrus essential oils are invigorating and lavender is calming.  Both of these essential oils can help improve feelings of lethargy.