Not only does lauric acid kill fleas, but it also helps prevent them because fleas avoid lauric acid in any form. Fleas can detect lauric acid and avoid the substance. ... Once fleas encounter the oil, it's challenging for them to escape from the substance that will break down their tiny bodies.

What does lauric acid do to fleas?

Coconut oil kills and repels fleas due to the ingredient lauric acid. This solution can be rubbed through your pet's coat or given to them orally.

What will instantly kill fleas?

The most common product used to kill fleas on dogs instantly is Nitenpyram, more commonly known as Capstar. This single-use tablet is administered orally and kills fleas within 30 minutes. It is recommended that you contain your pet in a small area when using Capstar.