red berries from the wintergreen plant that may be harmful essential oils

Essential Oils to Avoid: A Guide for Safe Use

While essential oils offer a myriad of benefits, it’s crucial to be mindful of the ones you choose to use. Some essential oils can cause adverse reactions, especially if used improperly or without proper knowledge. This guide will highlight essential oils that are best avoided, along with the reasons for caution. Understanding these oils can help you make informed choices for your well-being.

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Potentially Harmful Essential Oils

Wintergreen: The Potentially Harmful Oil

Wintergreen essential oil is known for its strong, minty aroma and is often used for its pain-relieving properties. However, it contains methyl salicylate, which can be toxic if ingested or applied in high concentrations. Even small amounts can lead to serious health issues, including respiratory problems and liver damage. It’s best to steer clear of wintergreen oil, particularly for children or individuals with underlying health conditions. 

Camphor: The Risky Choice

Camphor essential oil is sometimes used for its soothing effects on sore muscles and coughs. However, it can be very toxic if ingested, even in small amounts. Symptoms of camphor poisoning can include seizures, confusion, and respiratory distress. Pregnant women should also avoid camphor, as it can pose risks to fetal development. Always consult with a healthcare professional before considering this oil. 

Cinnamon Bark: The Irritant

Cinnamon bark essential oil has a warm, spicy scent that many find comforting. However, it can be a potent irritant, especially for sensitive skin. Applying cinnamon bark oil without proper dilution can lead to skin burns or allergic reactions. Additionally, its strong properties can be harmful if ingested in large quantities. It’s safer to use cinnamon leaf essential oil, which is milder and less irritating. 

Clove: The Potent Oil

Clove essential oil is well-known for its warming and stimulating properties, often used in dental care products for its numbing effect. However, it can be very irritating to the skin and mucous membranes, and its high eugenol content can cause respiratory issues if inhaled in large amounts. Clove oil should be used with caution, especially around children or individuals with respiratory conditions. 

Oregano: The Strong Antimicrobial

Oregano essential oil is praised for its powerful antimicrobial properties, making it a popular choice in natural medicine. However, its potency can also lead to skin irritation or gastrointestinal distress when ingested improperly. People with sensitive skin should avoid topical application without thorough dilution. Additionally, individuals taking blood-thinning medications should consult a healthcare provider before using oregano oil. 

Thyme: The Skin Irritant

Thyme essential oil is often used for its antiseptic and antibacterial qualities. However, like oregano and clove, it can be quite strong and may cause skin irritation or allergic reactions if applied undiluted. Individuals with sensitive skin should exercise caution and perform a patch test before using thyme oil. Pregnant women and young children should also avoid thyme essential oil due to its potential risks. 

Sage: The Hormonal Disruptor

Sage essential oil is known for its earthy, herbal scent and is sometimes used for its relaxing effects. However, it can disrupt hormonal balance, particularly for women. Sage oil is often contraindicated during pregnancy due to its potential to stimulate uterine contractions. Additionally, individuals with hormone-sensitive conditions should avoid sage oil to prevent exacerbating their symptoms. 

Geranium: The Mixed Blessing

Geranium essential oil is often used for its uplifting aroma and potential skin benefits. However, it can also cause allergic reactions or skin sensitivities in some individuals. If you have sensitive skin, it’s wise to perform a patch test before using geranium oil topically. Pregnant women should consult their healthcare provider before using geranium oil due to potential hormonal effects. 

Juniper Berry: The Diuretic

Juniper berry essential oil is used for its cleansing properties and is often included in detox blends. However, it is a strong diuretic and can cause dehydration or electrolyte imbalance when used excessively. Individuals with kidney issues or pregnant women should avoid juniper berry oil. Always consult with a healthcare provider if you have concerns about using juniper oil. 

Basil: The Hormonal Consideration

Basil essential oil is valued for its calming properties and is often used in aromatherapy. However, it can also affect hormonal balance, particularly in women. Basil oil may stimulate menstrual flow, so it should be avoided during pregnancy. Those with hormone-sensitive conditions should also approach basil oil with caution. 

Citrus Oils: The Photosensitizers

Citrus essential oils, such as bergamot, lemon, and lime, are known for their refreshing scents. However, they can increase skin sensitivity to sunlight, leading to sunburn or skin damage. It’s best to avoid applying citrus oils to skin that will be exposed to sunlight within 12 hours. Instead, consider using them in a diffuser or for inhalation to enjoy their uplifting benefits without the risk of photosensitivity. 

General Essential Oil Precautions

Essential oils are powerful, and it’s important to use them responsibly. Always dilute essential oils with a carrier oil before topical application. Essential oils should not be ingested unless under the guidance of a healthcare professional. Keep essential oils out of reach of children and pets, and store them in a cool, dark place to maintain their efficacy.


To visit our Essential Oil Safety blog where you can learn an array of essential oil safety guidelines, click here.

Final Thoughts

While essential oils can greatly enhance your wellness journey, it’s important to be aware of the ones that may cause harm. By avoiding oils that can lead to adverse reactions, you can ensure a safer and more enjoyable experience with aromatherapy. Always remember to research and consult with professionals if you’re unsure about the safety of a particular essential oil. There are so many natural remedies in this world, and finding the ones that meet your specific needs are just a few natural ingredients away. Welcome to your new journey of being a Naturel. Hope to see you a lot more in the near future! 


XO Zaya.


Have you had any experiences with essential oils that you avoided? What did you learn from them? Share your thoughts in the comments section below! 

About the Author


Leaza is a licensed cosmetologist and a natural enthusiast. The love of writing combined with the love of nature and wanting to help others has influenced her to write blogs and create natural home, bath and body products.

Head shot of author Leaza Norman

Disclaimer: This content is for informational and educational purposes only. It is not intended to provide medical advice or to take the place of such advice or treatment from a personal physician. Neither Zaya Naturel nor the publisher of this content takes responsibility for possible health consequences of any person or persons reading or following the information in this educational content. Be sure to contact your physician before trying any of the items stated in the above article.

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