Home Ingredients GS15-4® (Enzyme-Fermented Ginseng — Ilhwa)
EnergyCognitiveImmune Support

GS15-4® (Enzyme-Fermented Ginseng — Ilhwa)

Panax ginseng
Evidence Level
Limited
0 Clinical Trials
3 Documented Benefits
2/5 Evidence Score

GS15-4® is an enzyme-fermented Panax ginseng from Ilhwa, processed so the ginsenosides are pre-converted into the metabolite forms (such as compound K) the body normally has to make in the gut. This fermentation is designed to substantially improve absorption of ginseng's actives.

Studied Dose Around 165 mg of fermented ginseng extract per day.
Active Compound Enzyme-fermented Panax ginseng standardized for metabolized ginsenosides (compound K / IH901), for enhanced absorption.

Benefits

Energy and vitality

Ginseng is traditionally used and studied for supporting energy, stamina, and resistance to fatigue, which GS15-4 aims to deliver in a better-absorbed form.

Cognitive support

Ginseng is studied for supporting mental performance and a calm, alert state.

Immune support

Ginseng is studied for supporting a balanced, resilient immune system.

Mechanism of action

1

Pre-converted ginsenosides

Fermentation converts ginsenosides into their active metabolites (such as compound K) in advance, so more is absorbed regardless of a person's gut bacteria.

2

Adaptogenic action

Ginseng acts as an adaptogen, supporting the body's resilience to physical and mental stress.

Clinical trials

Side effects and drug interactions

Common Potential side effects

Generally well-tolerated — adverse effects are uncommon at normal doses.
Mild digestive upset is occasionally reported.
Discontinue if any unusual reaction occurs.

Important Drug interactions

Blood pressure and blood sugar medication — ginseng may affect both; monitor.
Stimulant effect may disturb sleep if taken late.
Tell your doctor if pregnant, breastfeeding, or taking blood thinners.

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Frequently asked questions about GS15-4® (Enzyme-Fermented Ginseng — Ilhwa)

What is GS15-4?

GS15-4® is an enzyme-fermented Panax ginseng from Ilhwa, processed so the ginsenosides are pre-converted into the metabolite forms (such as compound K) the body normally has to make in the gut. This fermentation is designed to substantially improve absorption of ginseng's actives.

What is GS15-4 used for?

GS15-4 is researched primarily for Energy, Cognitive, and Immune Support. Ginseng is traditionally used and studied for supporting energy, stamina, and resistance to fatigue, which GS15-4 aims to deliver in a better-absorbed form.

What is the recommended dosage of GS15-4?

The clinically studied dose is Around 165 mg of fermented ginseng extract per day. Always follow the product label and check with a healthcare provider for personal advice.

Is GS15-4 safe, and does it have side effects?

For most healthy adults, GS15-4 is well tolerated at studied doses. Reported effects can include: Generally well-tolerated — adverse effects are uncommon at normal doses. Mild digestive upset is occasionally reported. It may also interact with some medications. GS15-4 is not right for everyone, so check with a healthcare provider first if you are pregnant or breastfeeding, have a medical condition, or take prescription medication.

Does GS15-4 interact with any medications?

Possible interactions include: Blood pressure and blood sugar medication — ginseng may affect both; monitor. Stimulant effect may disturb sleep if taken late. If you take prescription medication, check with a pharmacist or doctor before using it.

How strong is the scientific evidence for GS15-4?

NutraSmarts rates the evidence for GS15-4 as Limited (2 out of 5). It is backed by 3 cited references summarized on this page. A higher rating reflects more, larger, and better-designed human studies.

References(3 citations)

Evidence ratings on NutraSmarts are based on the totality of human clinical research, with emphasis on randomized controlled trials, meta-analyses, and systematic reviews. The references below directly support claims made throughout this page.

  1. Ban MS, Kim Y, Lee S, Han B, Yu KS, Jang IJ, Chung HK, Lee S Pharmacokinetics of Ginsenoside Compound K From a Compound K Fermentation Product, CK-30, and From Red Ginseng Extract in Healthy Korean Subjects. Clinical Pharmacology in Drug Development. 2021;10(11):1358-1364. doi:10.1002/cpdd.949.PubMedUsed to support: Human pharmacokinetic study in healthy subjects showing that a fermented compound K product (CK-30) achieved substantially higher plasma concentrations of ginsenoside compound K versus unfermented red ginseng extract, supporting GS15-4's fermentation rationale for improved ginsenoside bioavailability.
  2. Jeon JH, Park JH, Jeon SY, Pang M, Choi MK, Song IS Concomitant Administration of Red Ginseng Extract with Lactic Acid Bacteria Increases the Plasma Concentration of Deglycosylated Ginsenosides in Healthy Human Subjects. Biomolecules. 2022;12(12):1896. doi:10.3390/biom12121896.PubMedUsed to support: Human clinical study showing that microbial pre-conversion of ginseng (via lactic acid bacteria co-administration) significantly increased plasma levels of deglycosylated, bioavailable ginsenosides in healthy subjects, supporting the biological rationale for GS15-4's enzyme-fermentation approach to enhance absorption.
  3. Reay JL, Scholey AB, Kennedy DO Panax ginseng (G115) improves aspects of working memory performance and subjective ratings of calmness in healthy young adults. Human Psychopharmacology. 2010;25(6):462-71. doi:10.1002/hup.1138.PubMedUsed to support: Human RCT demonstrating that standardized Panax ginseng extract improved working memory and subjective calmness in healthy adults, supporting cognitive and vitality benefits of GS15-4's ginsenoside actives; note: branded GS15-4 was not the study product.