PROVIDENCE — A Florida man has agreed to plead guilty in U.S. District Court in Providence to selling over the Internet kits that make anabolic steroids injectable.

Bryon Parker, of Delray Beach, allegedly grossed more than $900,000 in 2005 and 2006 by selling kits that convert anabolic steroids into an injectable type, federal authorities said yesterday.

He sold the kits to people in Rhode Island and elsewhere.

Parker also agreed to forfeit $250,000 — proceeds of the sales, according to the announcement by U.S. Attorney Robert Clark Corrente and Mark Dragonetti, resident agent in charge of the Food and Drug Administration’s office of criminal investigations.

Parker, 32, ran Research Services LLC in West Palm Beach, Fla., the U.S. Attorney’s office said. The company’s Web site, researchlabsupply.com, advertised paraphernalia to be used to turn anabolic steroids from powder to an injectable liquid. The kits he sold included materials such as cottonseed or sesame oil, ethyl oleate, benzyl alcohol, sterile syringe filters and glass bottles.

In 2005, according to the agreement, Research Services grossed $240,395. Last year, gross sales reached $697,600.

The agreement calls for forfeiting the $250,000 in proceeds and identifies $219,067 seized by federal agents from accounts that Parker held. In the plea agreement, Parker concedes the forfeiture. The maximum penalty for selling drug paraphernalia is three years in federal prison and a $250,000 fine. Parker is scheduled to appear for arraignment on Jan. 10.