Cancer patients undergoing radiation therapy often suffer from dry mouth—a painful and disruptive side effect that can make daily life challenging. However, a new formula made with natural citrus oil may soon offer real relief.
The formula was created by researchers at the University of South Australia and Stanford University. It mixes limonene—a citrus oil found in lemons, limes and oranges—with healthy fats known as lipids.
When mixed together, they make the oil much easier for the body to absorb and reduce common side effects such as dry mouth and stomach pain.
In lab tests, the new mix was 180 times more soluble than pure limonene. In early trials, it increased absorption by more than 4,000 percent, according to a news release.
Dry mouth, or xerostomia, affects up to 70 percent of patients who get radiation for head and neck cancer. It can make speaking and swallowing very difficult and can lower the quality of life.
RELATED: Dry Mouth: What’s Really Causing It and How to Treat It
“Cancer patients undergoing radiotherapy and other medical treatments regularly experience dry mouth, which not only prevents them from comfortably swallowing, but can also have other negative and potentially life-threatening outcomes,” said co-researcher Leah Wright, a professor of chemical engineering at The University of Adelaide in Australia.
Limonene has long been known to help stimulate saliva production, but high doses were needed to be effective. Those doses often caused side effects like indigestion and “citrus burps.”
Lead author Clive Prestidge, head of the Nanostructure and Drug Delivery research group at the University of South Australia, says the new formula solves that problem.
“The therapeutic benefits of limonene are well known. It’s used as an anti-inflammatory, antioxidant and mood-enhancing agent, and can also improve digestion and gut function. But despite its widespread use, its volatility and poor solubility have limited its development as an oral therapy,” Prestidge said in a news release.
Wright added that even though limonene can be ingested directly, it’s not well tolerated, especially with folks who have dry mouth. “Plus, its poor absorption prevents it from effectively reaching the salivary glands — the target site,” she added.
“This inventive and highly impactful limonene-lipid formulation could provide a simple, effective oral solution for dry mouth, offering cancer patients long-lasting relief and comfort, improved oral health, and a higher quality of life during a difficult time,” Wright said.
The findings were recently published in the International Journal of Pharmaceutics.
Dry mouth can be uncomfortable, but there are several steps you can take to help ease symptoms and protect your oral health. Here are some expert-backed tips:
• Sip water frequently, especially during meals, to keep your mouth moist.
• Suck on ice chips or small pieces of frozen fruit for moisture and comfort.
• Use a humidifier in your bedroom, particularly at night, to add moisture to the air and prevent your mouth from drying out while you sleep.
• Choose soft, moist foods and avoid dry, spicy, or salty foods that may irritate your mouth or make dryness worse.
• Limit or avoid caffeine, alcohol, and tobacco, as these can worsen dryness and irritate sensitive tissues.
• Chew sugar-free gum or suck on sugar-free lozenges to stimulate saliva production. Look for products containing xylitol, which may also help prevent tooth decay.
• Brush your teeth at least twice daily with fluoride toothpaste, and floss gently. Visiting your dentist regularly is especially important when you have dry mouth, as you are at increased risk for cavities and oral infections.
• Talk to your medical team about available treatments or products that might help, such as prescription saliva substitutes or new innovations like the limonene-lipid formula discussed in this article.
• Sip water frequently, especially during meals, to keep your mouth moist.
• Suck on ice chips or small pieces of frozen fruit for moisture and comfort.
•Use a humidifier in your bedroom, particularly at night, to add moisture to the air and prevent your mouth from drying out while you sleep.
•Choose soft, moist foods and avoid dry, spicy, or salty foods that may irritate your mouth or make dryness worse.
•Limit or avoid caffeine, alcohol, and tobacco, as these can worsen dryness and irritate sensitive tissues.
• Chew sugar-free gum or suck on sugar-free lozenges to stimulate saliva production. Look for products containing xylitol, which may also help prevent tooth decay.
•- Brush your teeth at least twice daily with fluoride toothpaste, and floss gently. Visiting your dentist regularly is especially important when you have dry mouth, as you are at increased risk for cavities and oral infections.
• Talk to your medical team about available treatments or products that might help, such as prescription saliva substitutes or new innovations like the limonene-lipid formula discussed in this article.
Supporting yourself with practical strategies, maintaining open communication with your healthcare team, and staying informed about new options can make a meaningful difference in your comfort and well-being during treatment.
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