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Life Extension

Bio-Quercetin®, 30 Vegetarian Capsules

4.8 · 4967 reviews
956 ₽

Gluten Free 1 Daily Non-GMO LE Certified Up to 62 Times Greater Bioavailability‡ Dietary Supplement What Is Bio-Quercetin? Quercetin encourages heart health and supports a healthy immune response. But like many phytonutrients, quercetin isn’t easy to absorb. So we combined quercetin with fenugreek seed fibers to enhance "free" quercetin up to 18x (with up to 62x better total bioavailability) over standard quercetin formulas. Bio-Quercetin® Benefits Delivers 18x more bioavailable free quercetin (up to 62x better total bioavailability) Promotes immune, cardiovascular & endothelial health Helps protect against oxidative stress & supports a healthy inflammatory response ‡ Studied against powder Sophora japonica extract standardized to 98% quercetin

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Gluten Free 1 Daily Non-GMO LE Certified Up to 62 Times Greater Bioavailability‡ Dietary Supplement What Is Bio-Quercetin? Quercetin encourages heart health and supports a healthy immune response. But like many phytonutrients, quercetin isn’t easy to absorb. So we combined quercetin with fenugreek seed fibers to enhance "free" quercetin up to 18x (with up to 62x better total bioavailability) over standard quercetin formulas. Bio-Quercetin® Benefits Delivers 18x more bioavailable free quercetin (up to 62x better total bioavailability) Promotes immune, cardiovascular & endothelial health Helps protect against oxidative stress & supports a healthy inflammatory response ‡ Studied against powder Sophora japonica extract standardized to 98% quercetin

Customer reviews

5.0
verified purchase
expensive fella, but better Bio-availability and health benefits to boost immunity

LIFE Extension is an expensive brand, with higher quality supplements, with higher bio-availability, which the body can absorb better. I've learnt the hard way that it's more worth it to buy higher quality products which the body can absorb, than cheaper brands which are synthetic or made from cheaper sources that don't yield the desired results. Quercetin is good for immunity, I wish you good health too =)

2/1/2025
5.0
verified purchase
More bioavailable than regular Quercetin

This supplement is helping me settle my inflammation due to having out of control mast cells. The benefit of this supplement is my body absorbs it much faster and more efficiently as it is more bioavailable than regular Quercetin. I take one of these capsules per day with my main meal.

9/3/2025
5.0
verified purchase
Quercetin That Actually Absorbs Well

I’ve taken regular quercetin before, but the results were hit or miss because it doesn’t always absorb well. This product is different. The key ingredient, bio-quercetin (using a phytosome delivery system), has much better bioavailability, so you actually feel its antioxidant and anti-inflammatory benefits. For me, it’s been a solid support for immunity and overall wellness. The quality from Life Extension is excellent, with clean vegetarian capsules and a formulation that feels consistent and reliable. It’s a brand I trust because they tend to focus on research-backed products rather than just generic blends. The size of the bottle—30 capsules—is enough for a month, and while it’s not a huge supply, the improved absorption makes it worth it. For anyone who wants quercetin that really works, this is one of the better options I’ve found.

9/8/2025
5.0
verified purchase

Thank you for providing such outstanding supplements! The quality is exceptional, with thoughtfully selected ingredients that offer remarkable health benefits. Your products have made a significant positive impact on my overall well-being. I also appreciate the secure and reliable packaging. Thanks again, iHerb!

8/13/2025
5.0
verified purchase
For allergy and sinus

Bio-Quercetin has been a great addition to my daily supplement routine. It helps with inflammation and immune support, and I’ve noticed a difference in my overall recovery and energy levels. The formula is highly absorbable compared to standard quercetin, which is a big plus. Definitely a quality product worth trying. You need to give it at least one to two weeks to see the effects and after a month you don’t need to take the antihistamines medicine but you have to finish at least 3 months cycle

7/10/2025
5.0
verified purchase
Great quality

Great Quality ! The packaging and delivery .. the number of capsule is right. The ingredients and size of this is correct. It doesn’t taste bad all. It helps a lot as a daily supplement for my diet. I hope I’m going to get the benefits for my overall fitness . Best taken after workout

2/15/2025
3.0
verified purchase
Mixed results

I first bought the Quercetin from Now Foods and then tried this one for cholinergic urticaria but the outcome was the same. I read reviews that suggested it works great for seasonal allergies. Since this one uses Phytosome technology, I thought it would work better for me but it didn’t do much. It reduced the symptoms, but the effect was minimal

1/31/2025
5.0
verified purchase
MCAS relief

Been using quercetin for years and love this one even more than others. having MCAS it helps a lot.

4/18/2026
4.0
verified purchase
Ok

I was hoping for a bigger benefit but this quercetin didnt so much do my allergies and histamine intolerance. I’ve heard that someone’s you have to take it for longer than a month or see a result but I just don’t want to risk it, it’s so exhausting trying all this different supplements. I do trust the quality of this brand and hope that it works for others.

3/31/2026
5.0
verified purchase
Good quality BioQuercetin

Good quality BioQuercetin with a clean formula. I use it to support immunity and inflammation balance. Easy to take and well tolerated.

1/2/2026