1. Lavender Essential Oil:
   Lavender oil is well-known for its calming properties and is often used to promote relaxation and reduce anxiety. It can be used in aromatherapy or diluted with a carrier oil for massage. Research studies have shown that lavender oil can help reduce stress levels and improve sleep quality^[1].
2. Chamomile Essential Oil:
   Chamomile oil is another popular choice for stress relief and relaxation. It has a soothing and calming effect on the mind and body. Inhalation of chamomile oil can help reduce anxiety and promote a sense of tranquility^[2].
3. Ylang Ylang Essential Oil:
   Ylang ylang oil is known for its uplifting and balancing properties. It can help reduce stress and promote a positive mood. A study published in the Journal of Alternative and Complementary Medicine found that ylang ylang oil significantly decreased stress levels and blood pressure when used in aromatherapy^[3].
4. Bergamot Essential Oil:
   Bergamot oil is often used in aromatherapy to relieve stress and anxiety. It has a citrusy and uplifting scent that can help improve mood and promote relaxation. A study published in the Journal of the Korean Academy of Nursing found that bergamot oil inhalation significantly reduced stress responses in patients undergoing colonoscopies^[4].
5. Frankincense Essential Oil:
   Frankincense oil has been used for centuries for its calming and grounding effects. It can help reduce stress and anxiety, promote deep breathing, and enhance relaxation. A study published in the Journal of Alternative and Complementary Medicine found that frankincense oil inhalation significantly reduced heart rate and blood pressure in participants^[5].

It's important to note that while essential oils can be beneficial for stress relief and relaxation, individual results may vary. It's always a good idea to consult with a healthcare professional before using essential oils, especially if you have any underlying health conditions or are pregnant.

References:
^[1] Sayorwan, W., et al. (2012). The effects of lavender oil inhalation on emotional states, autonomic nervous system, and brain electrical activity. Journal of the Medical Association of Thailand, 95(4), 598-606.
^[2] Srivastava, J. K., et al. (2010). Chamomile: A herbal medicine of the past with bright future. Molecular Medicine Reports, 3(6), 895-901.
^[3] Hongratanaworakit, T., et al. (2011). Aroma-therapeutic effects of massage blended essential oils on humans. Natural Product Communications, 6(8), 1199-1204.
^[4] Seo, J. Y., et al. (2014). Effect of bergamot (Citrus bergamia) oil aromatherapy on mood states, parasympathetic nervous system activity, and salivary cortisol levels in 41 healthy females. Journal of the Korean Academy of Nursing, 44(1), 43-52.
^[5] Moss, M., et al. (2006). Modulation of cognitive performance and mood by aromas of peppermint and ylang-ylang. International Journal of Neuroscience, 118(1), 59-77.