One of the many natural methods for humans to repel fleas is to include more garlic in the diet. Because fleas dislike garlic's taste, eating it repels them because it is present in human blood when they try to bite.
Some other natural methods to repel fleas include rubbing lavender, cedar wood, eucalyptus or peppermint oil on the skin. All these oils are available at most pharmacies and supermarkets at economical prices. Lemon juice can also either be applied on the skin or consumed. To maximize effectiveness of these natural methods, a combination of oil applications and dietary measures is recommended.