The therapeutic effects of scented candles mainly stem from the scents they emit (aromatherapy) and the soft light they provide (phototherapy), which influence emotions, psychology, and even physiological states through the senses of smell and vision. Here are the therapeutic effects and scientific basis of different scented candle types: 
I. Aromatherapy: The Core Function of Aromatherapy 
Emotional regulation 
Lavender: Reduces cortisol (stress hormone) levels, alleviates anxiety, and improves insomnia (research published in the "Journal of Alternative and Complementary Medicine"). 
Citrus fruits (such as oranges and grapefruits): Stimulate the brain to release serotonin, enhancing the sense of happiness, and are suitable for combating winter depression. 
Frankincense/Boswellia: Ancient religious incense that can alleviate negative emotions through the olfactory limbic system and is often used in meditation. 
2. Cognitive Function 
Rosemary: A study conducted by Northumbria University in the UK found that its aroma can enhance memory by approximately 15%. It is suitable for use during study or work. 
Mint/Eucalyptus: Stimulates the trigeminal nerve, boosts mental alertness, and relieves migraines. 
3. Physiological Assistance 
Ungaria: Contains eucalyptol, which can relieve nasal congestion (similar to the effect of menthol), and is suitable for use when having a cold. 
Ginger/Cinnamon: Their warming properties enhance blood circulation, making them suitable for people with cold hands and feet in winter. 
II. Candlelight Therapy: Visual and Psychological Effects 
Biological rhythm regulation: 
The warm yellow light of the candle (with a color temperature of 1800K) is closer to the natural flame light and can stimulate the secretion of melatonin, helping one fall asleep (the reason for avoiding using electronic screens before bedtime is similar). 
Improvement of Concentration: 
The flickering candlelight can create a "sensory simplification" environment, reducing external distractions, similar to the function of meditation candles. 
Sense of Ceremony for Stress Relief: 
The act of lighting a candle is itself a form of mindfulness practice. By focusing on breathing and observing the flame, it helps reduce anxiety (the "anchoring effect" in psychology). 
III. Combinations of Different Flavor Types for Different Needs 
Requirements Recommended Aroma Type Scientific Principle
Deep relaxation Lavender + Chamomile Activates GABA receptors, reduces neural excitability
Enhancing energy Grapefruit + Cedar Limonene stimulates the sympathetic nerve, increases alertness
Relieving headache Peppermint + Basil Menthol inhibits the TRPM8 receptor, blocks pain transmission
Enhancing concentration Rosemary + Lemon 1,8-Cineole enhances acetylcholine activity
Anticipating seasonal depression Sweet Orange + Cinnamon (Warm Food Blend) Through olfactory association, evokes positive memories 
IV. Usage Notes 
Safety First: 
Each time, do not let it burn for more than 4 hours to prevent the wax oil from overheating. 
Before going to bed, make sure it is fireproof (you can use a candle or a heater instead of an open flame). 
Maximizing Effect Techniques: 
Light it 10 minutes in advance to allow the fragrance molecules to fully disperse. 
Combine deep breathing (abdominal breathing) to enhance the absorption of aromatic molecules. 
Crowd limit: 
Pregnant women should avoid using stimulating scents such as rosemary and cinnamon. 
People with asthma should avoid strong floral or woody scents. 
V. Advanced Options: Characteristics of Healing Candles 
Professional Aromatherapy Brand: 
Neom (UK), Aromatherapy Associates (with clinical-grade formula). 
Special Process: 
Cold-pressed essential oil (preserving more active ingredients), such as the Black Bottle series from Jo Malone. 
Energy Healing: 
Crystal candles (such as the gemstone series from Voluspa), designed in accordance with crystal energy theory. 
The healing effect of scented candles is the result of the synergy of multiple senses. When choosing them, one should consider one's own constitution and current state. If you are seeking professional healing effects, it is recommended to consult a certified aromatherapist (with IFA/NAHA qualifications) for personalized customization.