Core essential oils, being a blend of pure essential oils, can be highly irritating to the skin and are suitable for diffusion only, not direct application to the skin.

Yes, it is permissible. Based on personal observations of one's own condition, the use can be self-determined as needed. However, for better skincare results, it is advisable to use them in conjunction with meridian times and acupressure points. It is not recommended to use stimulating massage oils before bedtime.

Essential oils can deteriorate primarily due to exposure to sunlight, high temperatures, moisture, and bacterial contact with the bottle mouth. After opening, please store the essential oils/massage oils in a cool, shaded place where sunlight does not reach. Avoid touching the bottle mouth during use, and tightly close the bottle after each use, keeping them away from a heat source.

Each bottle of essential oil can vary due to different harvesting conditions, climates, and times of the plants. The chemical composition, structure, and proportion of aromatic molecules in the plants differ, which affects the appearance of the essential oil. However, all of these are natural phenomena and do not affect the quality of use. Please feel at ease to use them.

If the essential oils/massage oils have expired, or if there are obvious signs of deterioration in smell or texture, it may be due to improper storage leading to spoilage. In such cases, please discontinue use.