Quercetin
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Description
What is Quercetin?
Quercetin is an ubiquitous antioxidant plant compound found in high concentration, for example in onions, elderberries, capers, apples and blueberries. Quercetin is not only one of the most frequently studied flavonoids, but together with kaempferol is also the most commonly occurring flavonoid in plant-based foods.
Quercetin exists in several chemical forms in plants. One well-known compound is the flavonol rutin, which is composed of quercetin and the sugar rutinose.
| Food | Quercetin Content (mg per 100g) |
| Capers | 234 mg |
| Onions (raw) | 30-50 mg |
| Kale | 23 mg |
| Apples | 4-6 mg |
| Blueberries | 3-5 mg |
| Broccoli | 3 mg |
| Cherries | 2-5 mg |
| Grapes (dark) | 3 mg |
| Tomatoes | 1.3 mg |
| Green Tea | 2 mg |
Quercetin content in various foods
The Benefits of Quercetin
Quercetin belongs to the group of flavonoids and is valued for its antioxidant properties (Xu et al., 2019). Antioxidants help protect cells from the daily damage caused by oxidative stress, which plays a role in the development of diseases of civilisation (Kıran et al., 2023). Quercetin is considered one of the most important antioxidants in fruit and vegetables.
Quercetin is also being researched in connection with allergies. There is evidence that it can influence the release of histamine from mast cells, which may support a balanced reaction to allergens – such as in hay fever – and could play a role in the context of histamine intolerance (Yamada et al., 2022, Weng et al., 2012).
Clinical studies suggest that quercetin could also be useful for various complaints, such as for rheumatoid arthritis or in certain situations related to viral burden (Javadi et al., 2017, Pierro et al., 2023).
What Sets Our Quercetin Apart?
The edubily Quercetin capsules provide 600 mg of concentrated antioxidant power. Our capsules are completely free from controversial additives. We use only a pinch of rice flour as a filler.
Through the use of plant-based HPMC capsules, the edubily Quercetin capsules are also ideal for vegans and vegetarians.
Ingredients
Only what works. No fillers, no flow agents beyond what's truly necessary.
- Active: bioavailable form, fully dosed
- Sweeteners: stevia and erythritol, never aspartame or sucralose
- Flow agents: plant-based, only where technically needed
- Vegan capsule shell (where applicable)
Safety & quality
Every batch is tested in an accredited lab for lead, cadmium, mercury and arsenic. Microbiological controls per Ph. Eur. standards.
Selected products are certified via the Kölner Liste®. Anti-doping safety for competitive athletes.
Science
Our doses are based on published human studies, not on the German minimum recommendation.
Sources and further reading are available in the edubily® science briefing.
How to take it.
Measure your dose
Use the scoop in the pack. For most products: 1 serving per day.
Mix with water
Stir into 200–300 ml of water or a cold drink. Brief stir, done.
At the right time
Depending on the active, take it at breakfast, before training or before bed. Details in the description.
From the founders
“We've been developing supplements since 2010 — the kind we take ourselves and would recommend to our own parents. No label cosmetics. Just what works, in the dose that works.”
Founders of edubily®
