You can fill up on collagen—the essential protein that keeps your body and skin running smoothly—through injectables, topically applied skin-care boosters, or supplements. But the easiest—and yummiest!—way to get a collagen fix is to sip it in a beauty drink.

Drinkable collagen is on the rise, and several celebs are already singing the elixir’s praises. And if their youthful skin isn’t enough to pique your interest, what could?

Scroll through to see why these 3 celebs are devoted to taking collagen.

1. Busy Philipps

The actress drinks collagen as often as she has coffee (every day). “I wake up between 6 and 7 in the morning and make Bulletproof coffee, which I’m obsessed with,” she says. “I use the Bulletproof brand coffee, grass-fed butter, collagen, protein powder, and MCT oil, plus a little vanilla bean if I’m feeling sassy.”

2. Jennifer Aniston

How exactly has the star improved on the pristine and glowing skin of her days playing Rachel Green? She credits collagen. “There’s a collagen peptide that I’ve been loving—I’ve been seeing a difference!” she said. “My nails are stronger and there’s a healthier…how do you explain it? A glow. It’s sort of that working from the inside-out thing.”

3. Tamara Mellon

The designer recently switched to a plant-based diet and has been drinking up her fruits—and collagen. “After I’ve worked out, I usually have fruit and a Garden of Life protein shake,” she said. “I also put Vital Proteins Collagen Peptides powder and blueberries and raspberries into my smoothie.”

Celebs are also really into this $1 ritual and getting the full benefits of apple cider vinegar.