Last update
4/7/2026
Reviewed By
Overview
SCIENTIFIC SCORE
Moderately Effective
Based on 1 Research
8
USERS' SCORE
Good
Based on 76 Reviews
8.1
Supplement Facts
Serving Size: 1 Veg Capsule
Amount Per Serving
%DV
Olive Leaf Extract (Olea europaea) (Standardized to min. 6% Oleuropein)
500 mg
**
Top Medical Research Studies
8
We investigated the anti-influenza effects of Isenolic, an olive leaf extract rich in elenolic acid. In a well-structured study, we compared Isenolic to the conventional flu treatment oseltamivir.
Our findings revealed that Isenolic showed promise as a natural alternative, particularly the 8% formulation, which offered robust inhibition of the virus and preserved cell health during infection.
While both treatments displayed activity against influenza, Isenolic emerged as a compelling option for future research and development in flu therapies.
Our findings revealed that Isenolic showed promise as a natural alternative, particularly the 8% formulation, which offered robust inhibition of the virus and preserved cell health during infection.
While both treatments displayed activity against influenza, Isenolic emerged as a compelling option for future research and development in flu therapies.
Read More
Most Useful Reviews
10
Fights infections
27 people found this helpful
OLIVE LEAF SAVED MY LIFE! I had two types of staph in my system and endured constant antibiotics, unable to sleep. I researched botanical remedies and finally tried Olive Leaf for its active component, oleuropein. This worked wonders! I haven’t had staph in four years, and it has helped others with recurrent colds, flu, and bronchitis. I take it daily for maintenance and have had remarkable results in fighting infections, even reversing ulcers!
Read More
9
Immune support
15 people found this helpful
My Nutritionist recommended this supplement years ago to bolster my weak immune system. I notice its absence but appreciate its slower working nature. It's an effective natural antibiotic, especially for combating flu and other illnesses during the colder months.
Read More
9
Prevents colds effectively
12 people found this helpful
I haven't had issues with the common cold, SARS, or flu for the past three years since I started taking this. I drink one capsule twice a day from November to April. After being sceptical initially, I found it helped me recover quickly from viral infections that previously led to prolonged illnesses.
Read More
Medical Researches
SCIENTIFIC SCORE
Moderately Effective
Based on 1 Research
8
- All Researches
8
We investigated the anti-influenza effects of Isenolic, an olive leaf extract rich in elenolic acid. In a well-structured study, we compared Isenolic to the conventional flu treatment oseltamivir.
Our findings revealed that Isenolic showed promise as a natural alternative, particularly the 8% formulation, which offered robust inhibition of the virus and preserved cell health during infection.
While both treatments displayed activity against influenza, Isenolic emerged as a compelling option for future research and development in flu therapies.
Our findings revealed that Isenolic showed promise as a natural alternative, particularly the 8% formulation, which offered robust inhibition of the virus and preserved cell health during infection.
While both treatments displayed activity against influenza, Isenolic emerged as a compelling option for future research and development in flu therapies.
Read More
User Reviews
USERS' SCORE
Good
Based on 76 Reviews
8.1
- All Reviews
- Positive Reviews
- Negative Reviews
10
Fights infections
27 people found this helpful
OLIVE LEAF SAVED MY LIFE! I had two types of staph in my system and endured constant antibiotics, unable to sleep. I researched botanical remedies and finally tried Olive Leaf for its active component, oleuropein. This worked wonders! I haven’t had staph in four years, and it has helped others with recurrent colds, flu, and bronchitis. I take it daily for maintenance and have had remarkable results in fighting infections, even reversing ulcers!
Read More
9
Immune support
15 people found this helpful
My Nutritionist recommended this supplement years ago to bolster my weak immune system. I notice its absence but appreciate its slower working nature. It's an effective natural antibiotic, especially for combating flu and other illnesses during the colder months.
Read More
9
Prevents colds effectively
12 people found this helpful
I haven't had issues with the common cold, SARS, or flu for the past three years since I started taking this. I drink one capsule twice a day from November to April. After being sceptical initially, I found it helped me recover quickly from viral infections that previously led to prolonged illnesses.
Read More
9
Immunity support
9 people found this helpful
Works great! I have Lyme disease and my immunity is very low. When the flu came through my region, I had read that this was best combined with the flu shot I had in the fall and frequent hand washing. I took these three times a day and kept my fingers crossed—no sniffles at all. I take many NOW products as they are affordable.
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10
Effective flu remedy
8 people found this helpful
Knocked out flu in 24 hours! I experienced a fever, chills, and severe headaches, but all symptoms vanished within 24 hours. I took double the dosage without any side effects. It's a powerful natural anti-viral, antibiotic, and antioxidant—such a blessing!
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Frequently Asked Questions
10
Effective flu remedy
8 people found this helpful
Knocked out flu in 24 hours! I experienced a fever, chills, and severe headaches, but all symptoms vanished within 24 hours. I took double the dosage without any side effects. It's a powerful natural anti-viral, antibiotic, and antioxidant—such a blessing!
9
No flu infections
2 people found this helpful
I began using Now Foods Olive Leaf Extract last winter as I was getting colds easily. Since then, I haven't had a cold or flu. When I felt a cold coming on last week, I took the extract again, and my stuffy nose cleared up without developing further.
9
Effective for flu
4 people found this helpful
I purchased olive extract to bolster my immunity. I used it for viral symptoms, alongside propolis and vitamin C, and achieved noticeable effectiveness—symptoms were alleviated in just three days. It appeared to be the common flu, but the overall combination proved effective.
9
Prevents colds effectively
12 people found this helpful
I haven't had issues with the common cold, SARS, or flu for the past three years since I started taking this. I drink one capsule twice a day from November to April. After being sceptical initially, I found it helped me recover quickly from viral infections that previously led to prolonged illnesses.
8
Effective flu prevention
Work great! Since my family has been taking this every day, we haven't fallen ill. Even my friends have remarked that they feel well during flu season. It's very easy to take.
9
Reverses flu symptoms
This is part of a two-tablet combo alongside oregano oil taken when I feel unwell, consistently reversing the onset of flu. I’ve remained well for over a year following this approach.
10
Winter flu prevention
2 people found this helpful
I bought olive leaf extract just before winter, having researched it for immunity against colds and flu. Remarkably, I didn’t catch a cough or cold all winter for the first time in ten years. I repurchased it for spring and will buy again this winter.
References
- Salamanca A, Almodóvar P, Jarama I, González-Hedström D, Prodanov M, et al. Anti-influenza virus activity of the elenolic acid rich olive leaf ( L.) extract Isenolic. Antivir Chem Chemother. 2021;29:20402066211063391. 10.1177/20402066211063391
Data last updated:
