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Moumoujus

POTASSIUM NITRATE.

Questionable CAS 7757-79-1 / ORAL CARE, SOOTHING

Potassium Nitrate is recognized primarily as a soothing agent, acting to mitigate discomfort by influencing nerve responses. In skincare, it additionally contributes anti-inflammatory and antimicrobial properties, making it relevant for alleviating skin irritations.

Summary

soothing anti-inflammatory antimicrobial

Science

Mechanism of Action

Potassium nitrate primarily functions as a soothing agent. While its well-established mechanism in dental applications involves inhibiting nerve transmission and preventing repolarization by elevating potassium ion concentrations at nerve endings, thus deactivating pain signals, its action on skin extends to anti-inflammatory and antimicrobial effects. These properties contribute to its ability to soothe irritated skin and are leveraged in formulations targeting acne and general skin irritations.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Key findings

  1. 01 Reduced cervical dentin hypersensitivity by 47.36% after three sessions and 74% after 3 months in a gel form (dental application).
  2. 02 Used in a desensitivity gel applied for 10 minutes prior to in-office bleaching to assess reduction of tooth sensitivity (dental application).
  3. 03 Topical application before in-office bleaching did not reduce the risk or intensity of tooth sensitivity (dental application).

Transparency

Dusting Analysis

Not commonly dusted

Potassium nitrate is an active ingredient with specific functions, not typically used as a filler or base ingredient that is subject to dusting practices in product formulation.

The Formula

Formulation

Solubility
Water
Optimal pH 4.5 – 6.5
0 7 14

Stability

Potassium nitrate exhibits moderate to high solubility in water, which increases with elevated temperature and pH. While an aqueous solution of 10% pure potassium nitrate powder is near neutral (pH 6.2 at 14 °C), skincare formulations generally aim for a pH range of 4.5-6.5 to ensure product stability and optimal skin barrier compatibility. It is sparingly soluble in most alcohols, insoluble in ethanol, but soluble in glycerol.

Conflicts

  • Reducing agents (potential for explosive reactions)
  • Organic materials (strong oxidizer, contact should be avoided due to fire risk)
  • High concentrations of salts in general (may lead to poor aesthetics or precipitation of other ingredients)

Safety

Safety Profile

CIR Status
Not reviewed
Sensitization risk Moderate

Potassium nitrate has not been explicitly reviewed by the CIR or SCCS for cosmetic use. While generally not considered to cause adverse health effects or skin irritation in animal models, there is evidence suggesting it can induce skin inflammation in certain individuals and is considered irritating to the eyes, skin, and respiratory tract. Improper use can lead to chemical burns. The FDA has recognized it for limited specific uses in food (e.g., antimicrobial, color adjunct), though conflicting information exists regarding its general prohibition in food. EWG rates it low for cancer, allergies & immunotoxicity, and developmental & reproductive toxicity.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Moderate
Comedogenicity Unknown

Our Assessment

Verdict

Questionable

Potassium Nitrate offers potential soothing, anti-inflammatory, and antimicrobial benefits for skin, yet its direct efficacy for topical skincare lacks robust clinical studies, and its safety profile requires caution given the 'not reviewed' CIR status and noted potential for skin irritation.

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