A Transformative, Timeless Bath Blend: Bath time is quality time. Especially when you’re relieving muscle aches, easing stress or headaches, calming overactive nerves, or preparing for a better night’s sleep. Choose a highly effective natural bath flake known to offer rejuvenating results. Ancient Minerals is the trusted formula made from pure Genuine Zechstein magnesium chloride from a pristine, 250-million-year-old seabed discovered miles underground.