If you are lacking in the hair department, you might want to head to McDonald’s.

A team of Japanese scientists claim eating the fast-food restaurant’s fries could help hair to re-grow after seeing promising results in lab tests, The Sun reports.

Apparently, the scientists have mass produced “hair follicle germs” which fuel hair development.

McDonald's fries may hold the key to a hair loss cure. (AAP)

They have also used a secret ingredient – the dimethylpolysiloxane chemical that is found in McDonald's fries.

The cells have been tested on mice but researchers trust the therapy will also work on human beings.

The dimethylpolysiloxane chemical is found in McDonald's fries. (9NEWS)

“This simple method is very robust and promising,” Yokohama National University Professor Junji Fukuda told the newspaper.

“We hope this technique will improve human hair regenerative therapy to treat hair loss such as androgenic alopecia (male pattern baldness).

“In fact, we have preliminary data that suggests human HFG formation using human keratinocytes and dermal papilla cells.”

The Golden Arches are the symbol of McDonald's. (AAP)