FAQs

* For shipping outside the United States please contact us before placing your order.

 

1. What makes Junsei Japan supplements different from other mushroom-based products?

Junsei uses a unique, highly bioactive strain of Shiitake mycelium selected from thousands for its exceptional quality. Produced using the patented L.E.M. extraction method in Japan, our formulas retain the highest concentration of polysaccharides like lentinan, known for their immune-supporting and cell-regenerating properties. Each ingredient is carefully sourced, plant-based, and intentionally formulated for synergy and purity.

2. What is L.E.M. Shiitake Mycelium, and why is it important?

LEM (Lentinula Edodes Mycelia) refers to the root-like structure of the Shiitake mushroom, which contains unique, highly potent compounds not found in the cap. Through the L.E.M. method, a proprietary extraction process developed in Japan, we concentrate its key nutrients—including lentinan, a beta-glucan studied for its immune-enhancing and liver-supporting properties.

 

3. Is there any scientific proof?

While it’s true that some natural products are overhyped, LEM is one of the most researched medicinal mushroom extracts, especially in Asia and Europe. Multiple peer-reviewed clinical trials have shown benefits for immunity, inflammation, and even as a chemo-adjunct. We always point people to the science so they can make informed choices — no hype, just facts. Check out the links to independent studies on our Studies and Rearch page.

 

4. Why should I pay for a supplement when I could just eat shiitake mushrooms?

You’d need to eat pounds of shiitake mushrooms daily to get the same amount of bioactive lentinan you’d get in a single dose of LEM extract. This is a highly concentrated and standardized form — it’s not meant to replace food, but to deliver specific compounds in an efficient, controlled way.

5. I heard mushroom supplements are all the same — why should I take this one?

Most mushroom supplements are made from the fruiting body — LEM is from the mycelium, which has a very different bioactive profile. Plus, this extract is standardized, meaning you’re getting a consistent dose of the active compounds like lentinan and beta-glucans. It’s not just about ‘mushroom powder’ — it’s about clinically relevant extracts.

 

6. Is this just another wellness trend?

It might seem like that at first, but LEM has been used in traditional medicine for centuries, and it’s backed by modern science. It’s not a fad — it’s a functional ingredient that’s only now becoming more understood and available in the West. We’re just late to the party.

7. When should I take the supplements?

For Nighttime Rejuvenation, we recommend taking 4 tablets about 30–60 minutes before bedtime. Because it’s free of sedatives or hormones, it works gently with your body’s natural rhythms to support calm, deep rest without grogginess the next day. For Immune System Support (daytime) we recommend taking 4 tablets daily after a meal.

8. How long does it take to feel the effects?

Everyone’s body is different, but many customers report feeling improvements — like deeper rest or better daily energy — within the first 1–2 weeks. Some even report a noticeable difference after the first dose.  Consistency is key with natural supplements, and benefits often build over time.

9. Are Junsei products safe to use daily?

Yes. Our products are made with naturally derived, plant-based ingredients that are safe for long-term, daily use when taken as directed. However, if you’re pregnant, nursing, or under medical supervision, please consult your healthcare provider.

10.  Are there any known side effects?
Our ingredients are carefully chosen for their history of safe, traditional use. While side effects are uncommon, as with any supplement, some individuals may experience mild digestive changes when starting something new, so taking them with a meal may help.

 

11. Where are Junsei supplements made?

Our products are formulated and produced in Japan, under strict quality control standards in certified manufacturing facilities. We use traditional Japanese ingredients enhanced by modern, research-driven processing for maximum purity and efficacy.

12. Can I take both formulas together?

Absolutely. Junsei Nighttime and Immune System Support are designed to complement each other. You can take Immune System Support in the morning to boost daytime energy and defense, and Nighttime Rejuvenation in the evening to wind down and promote restful sleep.