BORIC

Metaboric acid: Main Effects & Top 5

Published May 5, 2026·1min read

Metaboric acid (HBO₂) is a trace component with gentle antibacterial and anti-inflammatory action. It keeps the skin surface clean and is often found alongside acidic springs.

Table of Contents

What is Metaboric acid?
Main Effects
Metaboric acid Top 5 Hot Springs

What is Metaboric acid?

Metaboric acid (HBO₂) is a trace component with gentle antibacterial and anti-inflammatory action. It keeps the skin surface clean and is often found alongside acidic springs.

Main Effects

Antibacterial and anti-inflammatory actionMetaboric acid has a mild antiseptic effect that helps suppress the growth of bacteria on the skin's surface. Historically, it has been used as a preservative in pharmaceutical products. This gentle action helps keep the skin calm and clean.
Keeps skin surface cleanThe component's weakly acidic properties help regulate the skin's surface pH. This provides an auxiliary cleansing effect, supporting the skin's natural barrier and keeping it refreshed after bathing.
Often coexists with acidic springsMetaboric acid is often found in hot springs of volcanic origin. It tends to emerge from the ground along with sulfides and hydrogen ions, which are key components of many acidic springs.

Metaboric acid Top 5 Hot Springs

Top 5 hot springs registered on this site with the highest content.

RANKING BY THIS MINERAL CONTENT

References

SPRING TYPEMay 5, 2026· 1min read

Simple Springs (Tanjun Onsen): Gentle Waters for Everyone

Simple springs have dissolved components below 1,000 mg/kg and a source temperature of 25°C or above. Mild and non-irritating, they are safe for all ages. Alkaline simple springs (pH 8.5+) are famous for leaving skin silky smooth.

MINERALMay 5, 2026· 2min read

Metasilicic Acid: The "Beauty Spring" Standard Mineral & Top 5 Onsen

Metasilicic acid (H₂SiO₃) is a natural moisturizer also found in skincare lotions. Hot springs containing more than 50mg/kg are called "beauty springs" — leaving skin hydrated long after bathing. This is one of the therapeutic spring criteria in Japan's Mineral Spring Analysis Guideline (Table 1-1).

MINERALMay 5, 2026· 1min read

Sodium ion: Main Effects & Top 5

Sodium ion (Na⁺) is the key component of chloride and bicarbonate springs. It forms a thin salt film on the skin, locking in warmth long after bathing.