Quick answer: Kerassentials is applied to the skin, so most side effects are local: redness, itching, burning, stinging or a rash, usually from essential oils, menthol or camphor. It contains almond and walnut oil (tree nuts). It must never be swallowed. People with diabetes, poor circulation, nut allergies or broken skin around the nail should talk to a doctor first.
Possible Kerassentials Side Effects by Ingredient
| Ingredient | Possible reaction | Who should be careful |
|---|---|---|
| Tea tree oil | Redness, irritation; toxic if swallowed | People with sensitive skin or essential-oil allergies |
| Clove bud oil | Skin irritation or allergy (eugenol) | People with fragrance allergies |
| Lemongrass, lavender, manuka oils | Irritation or contact allergy | People with sensitive skin |
| Menthol & camphor | Burning or tingling; camphor is toxic if swallowed | Children; anyone with broken skin |
| Sweet almond & walnut oil | Allergic reaction in sensitive people | People with tree-nut allergies |
| Undecylenic acid (5%) | Mild irritation | Generally well tolerated on skin |
Source for tea tree oil safety: NCCIH: Tea Tree Oil.
The Label's Own Cautions
The official Kerassentials label says: for external use only; avoid contact with eyes; do not swallow; if swallowed, drink water and seek medical attention; discontinue use if irritation occurs; do not exceed the recommended dose; keep out of reach of children; do not use if the safety seal is damaged or missing; store in a cool, dry place.
Diabetes, Poor Circulation & Older Adults
Foot problems need extra care if you have diabetes, nerve damage or poor circulation, because small injuries can turn into serious infections. The AAD notes that people with conditions like diabetes may need ongoing care for nail fungus. Have a doctor or podiatrist check your feet before using any home product, and never cut or file nails so deeply that the skin breaks. (American Academy of Dermatology: Nail fungus treatment)
Who Should Not Use Kerassentials Without Medical Advice
- People with a tree-nut allergy
- People allergic to tea tree, clove, lavender or other essential oils
- People with diabetes, poor circulation or neuropathy in the feet
- Anyone with broken, cracked or infected skin around the nail
- Pregnant or breastfeeding women
- Children
What to Do if You Have a Reaction
- Stop using Kerassentials
- Wash the area gently with mild soap and water
- Call your doctor if redness, swelling or blistering doesn't improve
- If someone swallows it, call Poison Control at 1-800-222-1222 or seek emergency help
See a doctor or podiatrist promptly if…
the skin around a nail is red, warm, swollen, painful or draining pus; a nail is bleeding or lifting quickly; you have diabetes, poor circulation or a weakened immune system; or the problem is spreading. These need professional care, not a home oil.
Is Kerassentials FDA Approved?
No. The label carries the statement that it has not been evaluated by the FDA and is not intended to diagnose, treat, cure or prevent any disease. Prescription nail-fungus treatments such as efinaconazole, tavaborole and terbinafine are FDA-approved; Kerassentials is not. Be wary of websites showing an “FDA Approved” badge for it.
Considering Kerassentials?
Check the full label for allergens, then review the current price and the 60-day refund policy on the official site.
Check Kerassentials Price → Opens the official Kerassentials order page (secure BuyGoods checkout). Prices checked October 8, 2026; confirm the total at checkout.Frequently Asked Questions
Does Kerassentials have side effects?
Possible side effects include skin redness, itching, burning and rash, mostly from essential oils, menthol and camphor. Stop using it if irritation occurs.
Can I use Kerassentials if I'm allergic to nuts?
Kerassentials contains sweet almond oil and walnut oil. Talk to your doctor before using it if you have a tree-nut allergy.
Is Kerassentials safe for diabetics?
People with diabetes should have any nail or foot problem checked by a doctor or podiatrist first, because foot infections can become serious. Kerassentials is not a substitute for diabetic foot care.
What happens if you swallow Kerassentials?
The label says not to swallow it; if swallowed, drink water and seek medical attention. Tea tree oil and camphor are toxic if swallowed. Call Poison Control at 1-800-222-1222.
Can children use Kerassentials?
The label says to keep it out of reach of children. Don't use it on a child without a doctor's advice.