There’s a reason they call her The Body. Supermodel Elle Macpherson showed us that she looks as gorgeous in a swimsuit now as she did almost 30 years ago when she first appeared on the cover of Sports Illustrated. Macpherson, who turned 50 in March and has two sons (ages 11 and 16), posted a photo of herself in a bikini to Twitter, on Tuesday, along with the caption, “Super greens … After super swim.” The photo shows her looking incredibly fit and toned while leaning against the railing of a boat, green juice in hand.

Want to know the secret to the Australian-born beauty’s enviable shape? For one thing, she drinks a daily alkalizing greens supplement called The Super Elixir. Made by WelleCo, the health care brand Macpherson founded, the mix contains 45 ingredients including super greens and Chinese herbs. Macpherson has been taking the supplement every day for years and swears by it. If you’d like to try it yourself, you can get it for a cool $135 at welleco.com. Whether you give more credit to greens or genes, she sure looks great!

You can check out Macpherson and other celebs looking good in swimsuits in our bikini gallery!