500mL ONSEN Magnesium Bath Tonic
Ancient Japanese Hot Springs
500mL ONSEN Magnesium Bath Tonic
Ancient Japanese Hot Springs
Bath Tonic
500 mL
500mL ONSEN Magnesium Bath Tonic
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500 mL Bottle = 5 Baths
A tribute to Japan’s traditional hot springs, where water, nature, and silence meet. This tranquil soak blends the grounding woodiness of hinoki cypress with the bright citrus warmth of yuzu - a pairing that feels both clean and deeply calming.
Inspired by the mindful ritual of Onsen bathing, it’s best enjoyed in moments of stillness, when your body seeks pause and your mind needs quiet.
How it feels
Pure. Balanced. Like a breath of mountain air through warm, mineral-rich steam.
- Aromatherapy benefits – calming and uplifting
- Magnesium-rich to soothe the body and quiet the mind
- Ultra-hydrating and skin-softening formula
- No artificial fragrance, colour, or preservatives
-
Made in Melbourne with care
Measure 100 mL with ease using our Bath Tonic Measuring Cup.
Immerse yourself in a luxurious, mineral-rich bath where the opaque milky water creates a sense of privacy and helps:
• Improve sleep quality
• Support your body's natural healing mechanisms
• Support stress, enhancing relaxation
• Hydrate and nourish your skin
• Prioritise physical and mental wellbeing
• Relieve muscle aches
• Reduce post-workout recovery time
BATH
Add 100 mL to warm, swirling water. Remove jewellery, slip in and relax for at least 20 minutes.
To enhance your experience, decant 100 mL into a small bowl, add a small amount of warm water (1 tbs) and swirl it gently. Pour the contents into the tub, and as you do, take three deep breaths, savouring the moment as the white mineral cloud gracefully envelops the clear water.
FOOT BATH
Add 30 mL into 5 L warm, swirling water. Immerse feet, relax and enjoy for at least 20 minutes.
Average quantities of minerals in 100 mL of liquid tonic. We recommend 100 mL liquid tonic per bath.
| Natural Mineral | mg/100mL | mg/1000mL (ppm) | Function |
| Mg Magnesium | 5,000 | 50,100 | Helps relax, reduce anxiety, ease stress. Supports muscle recovery, nerves, heart health and strong bones. |
| Cl Chloride | 15,350 | 153,500 | Helps relax, reduce anxiety, ease stress. Supports muscle recovery, nerves, heart health and strong bones. |
| K Potassium
|
127.9 |
1279 | Helps reduce anxiety and stress, regulates heart rhythm, muscle contractions, and fluid balance. |
| B Boron
|
2.4 | 22.4 | Supports bone health, brain function, and hormonal balance. |
| Si Silica
|
<100 | <1000 | Promotes healthy skin, hair, nails, and connective tissues. |
Each single soak contains 100 mL of the world's purest source of natural magnesium chloride and carefully selected botanical oils.
Our ingredients undergo meticulous testing to ensure their purity, authenticity, and quality.
Derived exclusively from natural sources and the earth itself.
• Vegan Friendly
• Made in Melbourne
• Female Founded
| What’s in it | Where it’s from | What it is |
| Natural Magnesium Chloride | Ancient Zechstein Seabed | Essential Mineral |
| Helianthus Annuus Seed Oil | Sunflower Seed | Skin Moisturiser |
| Cocamidopropyl Betaine & Polyglyceryl-10 Laurate | Coconut | Skin Cleanser |
| Hydroxypropyl Starch Phosphate | Corn | Thickener |
| Titanium Dioxide | Anatase | Mineral Thickener & Pigment |
| Pure Essential Oils | Plant Derived | Aromatherapy Fragrance |
Purified Water, Magnesium Chloride, Helianthus annuus (Sunflower) Seed Oil, Cocamidopropyl Betaine (Coconut Derived), Polyglyceryl-10 Laurate (Derived from Coconut, RSPO Certified Sustainable Palm Oil), Hydroxypropyl Starch Phosphate (Corn Derived), Titanium Dioxide, Cedarwood Oil, Mandarin Oil, Bergamot Oil, Hinoki Oil, Patchouli Oil, Yuzu Oil, Lime.

WHAT OUR CUSTOMERS ARE SAYING
If you are itching for a holiday in Japan, and languid days in an onsen, this wonderful bath Tonic is the next best thing, close the door on the world and revel in the scent, the stillness and when you are all done, order in the best local Udon and its like you have had a mini break!
It really does make you feel and smell like you are in a high-end spa.
Beautiful product! Smells and feels luxurious
So the thing is 39 Degrees kept popping up on my Facebook feed soo much- so obviously the algorithm knows me well!
So I ended up biting the bullet And buying a few different tonics while on sale and started with Onsen- and I’m glad I did!
Unlike bath salts or other products , Onsen has a very nice smell to it- just enough to create a sense of calm as you pour it into the bath and make you go “you know what, this feels right”.
The product itself is not greasy or anything like that- it sits on the water and is a soothing balm to your body and mind- I ended up staying in the bath, with my kindle for an hour and could have stayed longer!
Overall this was my first taste and I highly encourage it- self care is something we all should partake in and 39 Degrees is going on my list of “stock up and use use use!”
The best tonic to make bathtime truly relaxing like having a spa day at home.