Tennis player Jessica Pegula listed collagen peptides among the six products she relies on in a Six Picks interview with Page Six Style. The list also included sunscreen, hair clips, a recovery tracker, headphones and a travel bag.

Collagen peptides are short chains of amino acids made by breaking down collagen protein into fragments small enough to dissolve in liquid. That solubility is the entire commercial proposition: Pegula says she adds hers to a morning smoothie, her coffee, or plain water when she is traveling.

What Pegula actually said

She told Page Six that Vital Proteins has been part of her routine for years, and framed it in terms of maintenance rather than performance gains. "As an athlete, taking care of my body is a priority, especially throughout a long and demanding season," she said, describing collagen peptides as one way she supports her body through the season.

Pegula has a commercial relationship with the category. The interview notes she has teamed up with Vital Proteins and separately founded her own skin care brand, Ready 24, which is the context any reader should carry into the rest of the list.

Where the evidence stops

No study, trial or outcome figure appears anywhere in the piece, and none is claimed. This is a product list from an athlete ranked No. 4 in the world, not a research story, and Page Six is not pretending otherwise.

That is worth saying plainly because collagen marketing routinely closes the gap between a testimonial and a finding. A working professional saying a powder is part of her routine is a fact about her routine, and nothing more.

The rest of the list

The other five picks are unglamorous and mostly logistical: packing cubes, a bag of hair ties, a Whoop band she checks every morning for sleep and recovery data, calm music before matches, and sunscreen. Supergoop Play got the strongest language of the six, with Pegula calling sunscreen "probably my No. 1 beauty essential" because she spends so much time outdoors.

Bottom line

Pegula's wider point was that on-court results come from habits built behind the scenes, and the list reads that way. What it does not offer, and does not pretend to offer, is evidence that any one item on it does anything.