FSWW08 and Haelan 951: Nitrogen Fermented Soy Explained
Haelan Publishing TeamShare
If you have come across the code "FSWW08" in a research paper, or heard someone mention "nitrogen fermented soy," and wondered whether either has anything to do with Haelan 951, the short answer is yes. They are three names for one thing. I'd like to lay out plainly how the names fit together.
Last reviewed: October 2026 by the Haelan Publishing Team
Key takeaways
FSWW08 is Haelan 951. FSWW08 is the research designation that was used for Haelan 951 in blind and double-blind studies, and both names refer to the same product: a concentrated, organic, non-GMO nitrogen fermented soy beverage made by Haelan Products with a proprietary nitrogen fermentation process.
"Nitrogen fermented soy" describes how the product is made, "Haelan 951" is the name on the bottle, and "FSWW08" is the name that appears in scientific literature. Haelan 951 is classified by the FDA as a food, not a supplement or a drug, and we make no health claims for it based on any study.
Nitrogen fermented soy is soy that has been fermented under nitrogen instead of ordinary air, and Haelan 951 is the nitrogen fermented soy beverage made by Haelan Products.
What is FSWW08?
FSWW08 is the research name for Haelan 951. When researchers ran blind or double-blind studies, they needed a neutral code for the product so that a brand name would not influence anyone involved. FSWW08 was that code. In published papers you will see it described in phrases such as "a fermented soy product (FSWW08)" or "a fermented soy formulation (FSWW08)."
That is the whole story of the name. It is a label for the same liquid that is sold as Haelan 951, used in a setting where brand names are deliberately left out.
Is FSWW08 the same as Haelan 951?
Yes. FSWW08 and Haelan 951 are the same product, made by the same company with the same nitrogen fermentation process. I like to think of it the way a book can have a working title in the publisher's office and a different title on the cover: one manuscript, two names, depending on who is talking about it.
| Name | What kind of name it is | Where you will see it |
|---|---|---|
| Haelan 951 | Product name | On the bottle and at haelan951.com |
| FSWW08 | Research designation for Haelan 951 | In blind and double-blind studies and published scientific papers |
| Nitrogen fermented soy | Description of how Haelan 951 is made | In articles and conversations about the fermentation method |
So if you are looking for FSWW08 or for nitrogen fermented soy, Haelan 951 is the product you are looking for.
What is nitrogen fermented soy?
Nitrogen fermented soy is soy fermented in a nitrogen environment instead of open air. Fermented foods in general are defined by a 2021 expert consensus panel as "foods made through desired microbial growth and enzymatic conversions of food components." [1] Nitrogen fermentation is one particular way of doing that, and it is the method behind Haelan 951.
The details of our process are proprietary, but the outline is simple:
- Start with organic, non-GMO soybeans.
- Ferment them under nitrogen using Haelan's proprietary nitrogen fermentation process.
- Concentrate the result into a liquid fermented soy beverage.
Fermentation changes soy in ways researchers have described for many soy foods. For example, the Linus Pauling Institute notes that fermentation releases the sugar molecule from an isoflavone glucoside (the sugar-bound form of soy's best-known plant compounds), leaving the free form called an aglycone. [2] We cover that general science in fermented versus unfermented soy and in what makes fermented soy special.
What is in Haelan 951?
Haelan 951 is a concentrated organic, non-GMO fermented soy beverage that contains naturally occurring soy compounds, including isoflavones, saponins and phytosterols. It is classified by the FDA as a food, not a supplement or a drug.
It is a whole fermented soy food in liquid form, which makes it different in format from an isolated isoflavone capsule. If that distinction interests you, our comparison of soy isoflavone supplements and whole soy foods explains it. For serving size and usage, please follow the product label; our guide to making Haelan 951 part of your day has practical ideas for building the habit.
A quick, friendly note: this article is for educational purposes only and is not medical advice. If you have a health condition, take medication, are pregnant or have a soy allergy, talk with your healthcare professional before changing how you eat.
What this article does and does not say
This article makes one factual point: FSWW08, Haelan 951 and nitrogen fermented soy refer to the same product. It does not summarize what any FSWW08 study reported, and that is deliberate.
Haelan 951 is a food. The published work that uses the FSWW08 name consists largely of small pilot studies and individual case reports, which are early-stage research designs that cannot establish cause and effect. We do not make health claims for Haelan 951 on the basis of that research, and nothing here should be read as one. If you are curious about the research, the best step is to read the original papers with your healthcare professional.
Common questions
Is FSWW08 the same as Haelan 951?
Yes. FSWW08 is the research designation that was used for Haelan 951 in blind and double-blind studies. Both names refer to the same concentrated, organic, non-GMO nitrogen fermented soy beverage made by Haelan Products. The only difference is the setting: FSWW08 appears in scientific papers, and Haelan 951 is the name on the bottle.
What is nitrogen fermented soy?
Nitrogen fermented soy is soy that has been fermented in a nitrogen environment instead of open air. Haelan 951 is a nitrogen fermented soy beverage, made from organic, non-GMO soybeans with Haelan's proprietary nitrogen fermentation process and then concentrated into a liquid. It is classified by the FDA as a food.
Where can I buy FSWW08?
FSWW08 is not sold under that name. It is the research designation for Haelan 951, so the product to look for is Haelan 951, available from Haelan Products at haelan951.com. The bottle will say Haelan 951, and it is the same nitrogen fermented soy beverage referred to as FSWW08 in published studies.
Is Haelan 951 a supplement or a drug?
Neither. Haelan 951 is classified by the FDA as a food. It is a concentrated fermented soy beverage containing naturally occurring soy compounds such as isoflavones, saponins and phytosterols. It is not intended to diagnose or address any medical condition, and serving details are on the product label.
Why do studies say FSWW08 instead of Haelan 951?
In blind and double-blind studies, products are usually identified by a neutral code so that a brand name does not influence participants or researchers. FSWW08 was the code used for Haelan 951. That is why some published papers refer to "a fermented soy product (FSWW08)" without naming the brand.
The bottom line
One product, three names. Haelan 951 is the product, FSWW08 is its research designation, and nitrogen fermented soy is the description of how it is made.
Haelan 951 is a concentrated organic, non-GMO fermented soy beverage made with a proprietary nitrogen fermentation process. It is classified by the FDA as a food, not a supplement or a drug, and contains naturally occurring soy compounds such as isoflavones, saponins and phytosterols. For serving size and usage, please follow the product label.
References: [1] Marco ML, et al. The International Scientific Association for Probiotics and Prebiotics (ISAPP) consensus statement on fermented foods. Nat Rev Gastroenterol Hepatol. 2021;18:196-208. [2] Linus Pauling Institute, Oregon State University. Soy Isoflavones.
This content is for educational purposes only and is not intended to diagnose, treat, cure, or prevent any disease. Always consult your healthcare professional before making changes to your diet or health routine.