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Boosterspice is a compound that increases the longevity of human beings in Larry Niven's Known Space universe. With the use of boosterspice, humans can easily live into hundreds of years and, theoretically, it can extend life indefinitely.

Humans have been led to believe it is made from genetically engineered ragweed but, in Ringworld's Children, we discover it is actually adapted from Tree-of-Life, without the symbiotic virus that enabled hominids to metamorphose from Pak breeder stage to Pak protector stage.

On the Ringworld, there is an analogous compound, but they are mutually incompatible; the character Halrloprillalar dies, when in ARM custody after leaving the Ringworld, as a result of having taken boosterspice and previously having used the Ringworld equivalent.