“I might get a cramp once every two weeks now instead of every other night.”
Made for
Everyday tension
Targeted to your tension.
Neck & shouldersEases desk-job tightness, screen-time tension, end-of-day knots
Lower backLoosens stiffness from standing, lifting, long days
Knees & jointsCalms post-run flare-ups, arthritis stiffness, end-of-day ache
Post-workoutSoothes post-training soreness before it sets in
Restless legsQuiets the calves and feet that twitch after lights out
Jaw & TMJReleases nighttime clenching and morning jaw tightness
What it does in your body
Magnesium absorbs through your skin and reaches muscle tissue within minutes, where it quiets the overactive nerve signals that cause tension, cramping, and tightness. No pill. No GI route. No waiting on digestion to deliver it where you need it.
It's a match if you
- Take magnesium pills and want something that absorbs without the gut drama
- Wake up with neck or shoulder tightness and reach for ibuprofen too often
- Manage chronic tension that pills haven't actually solved
- Targeted to the site of tension
- No stomach issues
- Absorbs in under 60 seconds
- Designed for daily use
- Not targeted to any specific area
- Common GI side effects
- Variable absorption rate
- May cause buildup over time
| Ketro CALM | Oral Magnesium | Drugstore Topicals | |
|---|---|---|---|
| Targeted to site of tension | |||
| No GI side effects | |||
| Fast absorption (under 60s) | |||
| Skincare-formulated feel | |||
| No greasy residue | |||
| Designed for daily use |
Ketro started with a simple idea: topical relief products should actually work and feel good to use. Our formulation philosophy began with the Boston Red Sox. Prescription-strength, performance-grade topical products for professional athletes. CALM brings that same standard to daily magnesium: targeted, well-made, and something you'd genuinely want to use every day.
Transdermal delivery bypasses the GI system entirely. No diarrhea, no cramping, no waiting for digestion. Applied directly to the muscles that need it.
Magnesium chloride is small enough to pass through the stratum corneum and reach the muscle tissue directly underneath where you apply it. Studies show transdermal magnesium raises tissue magnesium without requiring oral absorption.
You'll know it's working when tension, cramping, or restlessness eases in the areas you apply it. Most people feel meaningful difference within 1â3 weeks of daily use â magnesium compounds with consistency.
Yes. Magnesium chloride is one of the smallest magnesium salts. It passes the skin barrier when applied topically and absorbs directly into the tissue beneath, bypassing the digestive system entirely. It goes skin to muscle, not skin to bloodstream to muscle.
Lightweight, fast-absorbing. Formulated like skincare. No chalky residue, no greasy film. Absorbs in under 60 seconds.
A quarter-sized amount per area, massaged in until absorbed. Most people apply 2â3 times a day â morning, post-workout, and before bed â focusing on wherever tension, soreness, or cramping shows up.
At that rate, one jar lasts about 30 days. Heavier application is fine; you can't overdose topically.
Localized tension and soreness often ease within minutes of application. For the deeper benefits, like steadier sleep, fewer cramps, and calmer legs at night, most customers feel the difference after 1 to 3 weeks of daily use.
Many customers use CALM for twitchy legs and nighttime calf cramping. Massaged into the calves, shins, and bottoms of the feet 20 to 30 minutes before bed, it often quiets the crawling sensation and reduces overnight cramping.
If you're already on a prescription medication for this, CALM isn't a replacement. But many find it works when oral magnesium alone didn't.
Rubbed along the jawline, masseter, and temple area, CALM eases the muscle tension that drives clenching. Apply before bed if you grind at night, or mid-day if stress-clenching is the pattern. Many customers keep a jar on the desk for this.
One of our most common use cases. Hip aches, shoulder tension, jaw clenching, and sleep disruption all improve with nightly application. If oral magnesium has been causing GI issues, transdermal delivery skips the gut entirely.
Applied to the lower abdomen and lower back 15 to 20 minutes before cramping typically starts, or during a flare, CALM can ease the muscle spasm without adding another pill to your routine. Many customers layer it with what they're already using.
Yes. Topical and oral magnesium work through different pathways, so there's no interaction risk at normal doses. Some customers switch entirely off oral magnesium (especially if it was causing GI issues); others use both. Listen to your body â if you notice loose stool, reduce oral intake first since that's the one with GI effects.
Magnesium chloride is generally considered safe topically during pregnancy and nursing. That said, we recommend checking with your provider before starting anything new in those windows â especially if you have complications or are near term.
A small percentage of people feel a mild tingle or itch on first application. It's often a sign of low magnesium in that tissue. The sensation usually fades within a few minutes and disappears entirely after 2 to 3 applications. If it persists or you develop a rash, stop using and we'll refund you.
CALM is built in a skincare cream base specifically to reduce the stinging and drying that straight magnesium oil causes.
Epsom salts (magnesium sulfate) diffuse through bathwater. Good for whole-body soaks, not targeted to specific tension areas, and you need a tub.
Magnesium oil (magnesium chloride + water) is potent but often stings and leaves a salty film.
CALM uses the same magnesium chloride as magnesium oil, in a skincare-grade cream base. Targeted, comfortable, and built for daily use without the film.
CALM comes three ways: one-time ($50), a 30-Day Supply ($35/mo, Save 30%), or a 90-Day Supply ($30/mo, Save 40%, our default). We recommend the 90-Day Supply because magnesium takes about three weeks of consistent use before you start to feel the difference. Cancel, pause, or change frequency anytime â no commitments.
