Geruma
Geruma Germanium Bath Black, 40g
Geruma Germanium Bath Black, 40g
Rated 5.2 out of 7.0 by Japan’s largest beauty community
Geruma Germa Bath Kuro Germa, a black bath additive with Dead Sea mud and germanium that turns the water dark and draws out a deep, cleansing sweat.
✓ 100% authentic, ships from Japan
✓ Duties & taxes included for US orders
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What it is
Geruma Germa Bath Kuro Germa is a Japanese bath additive, one 40g sachet per bath. Dissolved in the tub, it blends organic germanium, mineral-rich Dead Sea mud, natural salt, and capsicum extract to warm the body and encourage a heavy sweat, leaving skin feeling smooth and refreshed. The water turns a striking black.
Why it's different
It combines organic germanium with mineral-rich Dead Sea mud for a warming, mineral soak.
Natural salt and capsicum extract boost warmth and sweating beyond a plain hot bath.
The water turns black for a novel, spa-like soak that many hot-spring lovers enjoy.
How to use
1. Fill the tub with 150 to 200 liters of hot water, around 38 to 42C.
2. Add one 40g sachet and stir well.
3. Soak, adjusting the temperature to your comfort.
4. Rinse off in the shower afterward.
Geruma Germanium Bath Black, 40g
Frequently Asked Questions
Is this authentic?
Yes. We only buy from official retailers and directly from the brands here in Japan. Never resellers, never grey market stock.
We are beauty lovers too, so we know the worry, especially with something you are putting on your face. Authenticity is 100% guaranteed by us.
Why does the water turn black?
The Dead Sea mud and mineral content color the water dark. A little black residue may settle at the bottom, which comes from the salt's minerals and is harmless. Rinse the tub after use.
What is the point of the germanium and mud?
They create a warming, mineral-rich soak meant to raise body temperature and encourage a heavier sweat than plain hot water, leaving skin feeling smooth and refreshed afterward.
How hot should the bath be?
Around 38 to 42C works best, adjusted to how you feel. The additive makes the water warm you more effectively, so you may feel hot sooner than in a normal bath.
Any cautions when using it?
Do not use it in an enamel tub, and avoid reheating the water or using it in a circulating bath system. Rinse off in the shower after soaking, and keep the temperature comfortable.
We ship internationally from Japan!
International Delivery Rates
What are your shipping rates?
On orders under US$75, shipping is a flat US$20 to the United States and US$10 to all other countries.
Orders of US$75 or more ship free, applied automatically at checkout. Your exact shipping cost is shown before you pay.
How long does international shipping take?
These estimates are for International Airmail and include 3 to 5 business days of processing in Japan.
- United States: 12 to 15 days
- Canada, United Kingdom, France, Germany: 9 to 12 days
- Australia, New Zealand, Denmark, Finland, India, Indonesia, Italy, Netherlands, Spain, Sweden, Switzerland: 10 to 13 days
- China, Hong Kong, Malaysia, Singapore, South Korea, Taiwan, Thailand, Vietnam: 8 to 10 days
- Rest of the world: 11 to 18 days
Please note that these are estimates only. Actual delivery can be affected by customs clearance, seasonal congestion, or carrier delays in the destination country, all of which are outside our control.
Will I have to pay customs or import fees?
For US customers: All US orders ship DDP (duties delivered prepaid), meaning we prepay all import duties on our end. Nothing is due at your door.
For customers outside of the US:
Unfortunately, we are unable to process prepaid custom taxes for any other countries other than the US. Duties and import taxes are set by your local customs authority and are not collected at checkout, so any charges on delivery are your responsibility.