2003 – Although not agreeing to ban ephedra, a memo is sent to all major leaguers by the players’ union strongly recommending players “be extremely reluctant to use any products” containing the substance. The diet supplement, which is available without a prescription, has been linked to the spring training death of Baltimore Orioles pitcher Steve Bechler.

On March 5, 2003 — 2003 – Although not agreeing to ban ephedra, a memo is sent to all major leaguers by the players’ union strongly recommending players “be extremely reluctant to use any products” containing the substance. The diet supplement, which is available without a prescription, has been linked to the spring training death of Baltimore Orioles pitcher Steve Bechler.

Sources –
Baseball Reference March 5
SABR Games Project
National Pastime March 5
Retro Sheet
Replay The Game