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Beauty · Bath & body

Magnesium
bath flakes

by Ancient Minerals

Salt, hot water, and forty minutes nobody can reach you.

Magnesium chloride drawn from the Zechstein seabed, sold as flakes for the bath. One ingredient, no fragrance, no colour. It dissolves faster than Epsom salt and leaves the water feeling slightly soft. We keep the 8 lb bag by the tub and stop counting.

One ingredient Unscented Zechstein source Epsom alternative
from $10.95 / 1.65 lb Where to find it

Ancient Minerals direct, checked August 2026. Also in 4.4 lb and 8 lb bags.

Honest by nature

What is inside — and what is never

What is inside

  • Magnesium chloride, Zechstein source
  • Nothing else

What is never

  • Fragrance and dye
  • Fillers sold by weight
  • Claims about detoxing
  • A promise we cannot evidence
What we cannot claim

The claim that magnesium is absorbed through the skin in useful amounts is not well supported. A 2017 review called the case for transdermal magnesium unproven. Bathing in magnesium-rich salts does have measured effects on the skin barrier itself. So: buy it for the bath and the skin, not for the blood test.

Read: The honest case for a magnesium bath →
How to use it

The forty-minute bath

i.

Run it hot

Two large handfuls under the running tap. Let them dissolve before you get in.

ii.

Leave the phone

In another room. This is most of the active ingredient, and it is free.

iii.

Get out warm

Twenty to forty minutes. Rinse if you like, pat dry, and go straight to bed.

Medina
“I will not tell you the magnesium reaches your bloodstream. I will tell you that I sleep better on the nights I do this, and that it costs almost nothing to find out whether you do too.”
— Medina, founder of ETHOS
Where to find it

Continue to Ancient Minerals

Sold direct and through most large retailers. We do not sell it, hold stock, or handle your order.

Visit Ancient Minerals →

We have no affiliate agreement with Ancient Minerals. This is a plain link and we earn nothing from it.

Where these facts come from

Every price, ingredient and certification on this page was read from these pages on the date noted above.

  1. Ancient Minerals — Magnesium Bath Flakes (price, sizes, source)
  2. Gröber et al., “Myth or Reality — Transdermal Magnesium?”, Nutrients (2017)