To repel fleas on humans, there are several options available. Here are some ways to prevent flea bites on humans:

• Use Environmental Protection Agency (EPA)-registered insect repellents containing DEET, picaridin, IR3535, Oil of Lemon Eucalyptus (OLE), para-menthane-diol (PMD), or 2-undecanone.
• Cover skin with long-sleeve clothing and pants to minimize exposure to bites. Flea bites often occur on the lower legs and feet, so protect these areas with long socks and pants.
• Treat clothing and gear with products containing 0.5% permethrin. Permethrin can be used to treat boots, clothing, and camping gear and remain protective through several washings. Alternatively, you can buy permethrin-treated clothing and gear.
• Use natural flea repellents, including some essential oils, as flea repellents placed directly on the skin. A small-scale human study found that thyme oil and myrtle oil were more repellent against fleas on people than either permethrin or DEET.
• Wear clothing and gear treated with permethrin, which is known to be safe and effective in repelling fleas.

It is important to note that most fleas in the United States prefer to feed on animals, so the best way to prevent fleas on humans is to keep pets free of fleas.