Magnesium has quietly become one of the most talked-about supplements for sleep and recovery, and Scarlett Johansson is among the celebrities who swear by it. The Black Widow actress has described her magnesium routine in multiple interviews, framing it as a small evening habit with a big payoff for how she sleeps, digests and winds down.
Her endorsement lands at a moment when magnesium is trending across social feeds and pharmacy aisles. Here is what Johansson actually takes, why she takes it and how it fits into the rest of her nighttime lineup.
How Scarlett Johansson’s Magnesium Routine Works
Johansson takes magnesium at night as part of a stripped-down evening ritual. Speaking with TZR, she said the supplement has become a fixture in her wind-down.
“I take magnesium at night. It helps me sleep. I feel like it’s good for recovery. It’s good for your entire central nervous system,” she told the outlet.
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She pairs it with a low-effort skincare routine built around her own line, including a micellar cleanser, a prep serum, a night cream and an occasional boosting oil.
Why Magnesium Sleep Benefits Appeal to Johansson
The magnesium sleep conversation has gone mainstream, and Johansson has been open about why the supplement clicked for her. She told Byrdie that the effect goes beyond bedtime.
“I take magnesium. I know that everybody is taking magnesium now. It’s so helpful, it really makes a huge difference, especially in my digestion and my recovery, it’s awesome,” she said.
Johansson, who has been married to Colin Jost since 2020, also relies on a cold, dark room and a white-noise machine to stay asleep. She told Air Mail she falls asleep easily but has had a harder time staying asleep as she has gotten older.
The Form of Magnesium She Stopped Using
Not every version of the supplement made the cut. Johansson previously experimented with topical magnesium before switching to an oral version.
“I’ve been taking magnesium, which I think helps me sleep more soundly. I used to use a [magnesium] spray that you put on the bottom of your feet, but it dries your skin out,” she told Air Mail.
She has kept magnesium in her self-care rotation in another form, though. Johansson told W Magazine her at-home pedicure starts with a magnesium foot soak, followed by a salt scrub, filing, moisturizing and polish.
“My favorite form of self care is probably doing my own pedicure,” she said. “I am good at it.”
Where Magnesium Fits Into Her Broader Supplement Lineup
Magnesium is not the only supplement in her rotation. After noticing she felt depleted following breast-feeding, Johansson told Refinery29 she built out a fuller stack.
“I just started because I noticed that overall I was depleted, likely as a result of breast-feeding, so I now take vitamins C and D, calcium, magnesium, B-complex and omega-3s,” said the actress, who is a mom to kids Rose and Cosmo.
She has also added vegan collagen on a friend’s recommendation, even as her dermatologist has pushed back on the idea that ingestible beauty products deliver real results. Johansson told TZR she is trying it anyway to see whether her hair grows in thicker, faster and shinier.
