Bill Romanowski, an outside linebacker who played in five Super Bowls and now owns a nutrition company, will sign autographs and discuss his new product at this weekend's 31st annual Spring New Products Show & Hawaii Boat Show at Blaisdell Concert Hall.

Romanowski, who played 16 sometimes controversial seasons in the NFL with the San Francisco 49ers, Philadelphia Eagles, Denver Broncos and Oakland Raiders, said he will be available the whole weekend.

The 6-foot-4, 245-pounder owns Pure Romo, a nutrition company that sells Neuropath, a brain augmentor. He said he will be handing out samples.

According to its Web site, Neuropath "enhances pathways to the nervous system ... giving you improved brain-to-muscle communication. In layman's terms Neuropath will help you feel smarter, stronger, faster and more focused."

Romanowski said he got involved in trying to find ways to help improve the brain's function after he suffered three concussions over a four-week span, forcing him to retire from the NFL in 2003.

"I hired a world-renowned scientist (Thomas Incledon) to research ingredients to help my brain come back and perform at a very high level," Romanowski said by phone.

The end result is an "all-natural, FDA-approved" enhancer and a growing business.

Romanowski said the first time he took the product, "over night my brain started firing on all cylinders."

"The product will help people's memories, help focus, help attention to detail," he said. "I give it to a friend, a family member and tell 'em to take this and tell me what you think."

Romanowski calls this "one of the most incredible experiences of my life, right up there with winning Super Bowls."

He earned Super Bowl rings with the 49ers and Broncos (two each). Romanowski also had his share of controversy.

In a 60 Minutes interview, he said he took steroids for a two-year period starting in 2001. Last May, he agreed to pay a former Raiders teammate $415,000 in damages for a punch to the face during a practice drill in 2003.