You may have heard that pure essential oils do not cause allergic reactions. However, according to Oleg Maksimov of the American College of Healthcare Sciences, there is "...a connection between the oxidation of essential oil constituents and their ability to trigger allergic reactions". "To put it simply," says Maksimov, "spoiled (oxidized) essential oils have a greater risk of triggering an allergic reaction."
Citrus oils, which are commonly found in many beard oil formulas due to their many health benefits, are photosensitive and may cause your skin to become more sensitive to UV light. If you have a pale complexion that burns easily, you may want to consider an oil-free beard product instead.
According to wellnessmama.com, "I always include a caution on my recipes that include citrus oils that they may make the skin more sensitive to the sun. These oils have certain constituents that can make the skin more sensitive to UV light and can lead to blistering, discoloration of the skin or burning more easily from minor sun exposure. Though the risk of photosensitivity or phototoxicity varies based on the way the oil was distilled, oils generally considered photosensitive are: orange, lime, lemon, grapefruit, and bergamot."
Many companies claim that their beard oil is "all-natural". But how do you know if it's true? Check the label. If you find "fragrance", or "fragrance oil" listed in the ingredients, that means the beard oil contains synthetic fragrance oils that are not natural and not healthy.
According to safe cosmetics advocate Ava Anderson, "These chemicals include: benzene derivatives, aldehydes, phthalates, and a slew of other known toxins that are capable of causing cancer, birth defects, nervous-system disorders and allergies—some of which are cited on the EPA’s hazardous waste list."
Geranium oil has a natural, rose-like fragrance.
"The Environmental Working Group (EWG) reports that, while many popular perfumes, colognes and body sprays contain trace amounts of natural essences, they also typically contain a dozen or more potentially hazardous synthetic chemicals, some of which are derived from petroleum. To protect trade secrets, makers are allowed to withhold fragrance ingredients, so consumers can’t rely on labels to know what hazards may lurk inside that new bottle of perfume," says emagazine.com.
These materials will dry out your skin and beard, resulting in split ends and slow growth.