Free Shipping in the USA!

How our D-Mannose is Produced

Our D-Mannose is derived from D-Glucose, which is sourced from Non-GMO corn in the USA (formerly EU). We use a sustainable and safe separation process to derive the D-Mannose from the D-Glucose. 

We previously sourced all of our D-Mannose from the EU and the company in Ireland/Finland opened the first ever US-based D-Mannose sourcing facility at the end of 2020.

This high grade D-Mannose is manufactured for pharmaceutical purposes and we are one of only a few companies who purchase this for a Urinary Tract Support supplement. Specialists use only this specific D-Mannose for a condition called Congenital Disorders of Glycosylation (CDG) and we believe this higher grade should be available for urinary tract support as well. 

We manufacture and package our D-Mannose products in California in a Current Good Manufacturing Practices (cGMP) facility.  

Sources of D-Mannose
Currently, there are only two sources of D-Mannose on the market for urinary tract support supplements:

​Glucose: that is derived from Non-GMO Corn or Corn: we only use Non-GMO sourced from the USA (formerly EU) -- never China.

Birch: only available from a sourcing facility in China. There is no US or European source for birch.

D-Mannose Misinformation

There is a lot of misinformation online about where D-Mannose is sourced.

Although D-Mannose can be found in many foods such as cranberries, apples, berries, pineapple etc., there is no product on the market that is sourced from anything other than Corn (Ireland, Finland (EU), USA and China) or Birch (China). There's even a rumor going around that some products source from Jujube fruit, which is completely false. 

Corn vs. Birch

Some people ask us about the Birch Tree option, but we do not source from birch trees since this option is only available from China.  We have concerns with the lack of transparency with the processing etc.

We partner with many organizations who require that the Certificate of Analysis notes a properly sourced & regulated country of origin.

Of course, there are some high-quality facilities in China but if there is a choice we prefer to go with a company that can be held accountable to International Standards (ISO 9001).

Statement Concerning Allergies

The Allergy statement from our supplier notes: D-Mannose is manufactured from Non-GMO corn derived D-Glucose and does not contain any known allergen materials nor comes into contact with allergen materials during the process.

Transparency with Sourcing
We created this company because of all the misinformation about D-Mannose and that the majority of it is sourced from China while the label only indicates "Made in the USA" because it was packaged there.

Currently, the FDA only requires supplement companies to disclose where the product was packaged/made -- and not where it was actually sourced from. We find this to be so misleading and thought we deserve better.

We believe sourcing plays a crucial aspect of quality and that consumers have the right to know exactly what they are consuming - and the sourcing country of origin.

For more info about our quality standards please click here:

WCM Difference