A great natural insect repellant is Citronella Essential Oil.

Latin: cymbopogon nardus

Not just a deterrent for insects, Citronella is uplifting, clears the mind, is an antiseptic and is helpful for colds and flus.  Also good for aches and pains, Citronella can be added to massage oils and lotions along with other favourite essential oils, such as eucalyptus and peppermint. Citronella is a very helpful essential oil for oily skin and scalp, making it a great addition to lotions,
shampoos and also added to natural deodorants for its natural antiseptic and deodorant properties.