Comparing Beta 1,3/1,6 Glucan
products is straight forward. All you have to do is to
find out how much 1,3/1,6 Terminal Linkage Glucan (Active
linkage) is in the products you are considering.
The FDA requires every beta glucan
product to have a printed "Supplement Facts"
panel. A product's Supplement Facts panel tells more about
the effectiveness of the product than most websites.
The Supplement Facts panel will always
tell you the milligram dose of Beta Glucan in the product, but
there is no FDA requirement to tell you the purity of the Active
Linkage in the product.
There are only two types of Supplement
Facts panels.
One panel tells you the milligram dose
and the percentage of Active Linkage, the other tells just the
milligram dose.

This is the panel from our product, which factually tells you what the product contains.
1) The stated ingredients add up to 100%.
2) The 1,3 and 1,6 linkages are detailed. This product contains 88.7% Active Linkage.
Since only the 1,3 and 1,6 linkages are proven to effect the human immune system, the other linkages do not count. This is why advanced immune system products are called "Beta 1,3/1,6 Glucan".
The following Supplement Fact panel is the most common.

This type of panel does not tell you the percentage of the 1,3 and 1,6 Active Linkages, nor does it add up to 100%. This Beta Glucan product might contain 10% or 80% Active Linkage, but there is no way to know.
If the actual linkages are not shown, there is likely a reason they do not want to reveal their level of purity.
Every product will have different values for the linked-glucose it contains. Some retailers will add unrelated linkages, such as the 2,3 or 3,6, and claim their product is 95% or 100% "pure". If you do not understand what the retailer is doing, your immune system will.
All Beta Glucan products contain some amount of Beta 1,3/1,6 Glucan. Just because the label makes a claim of containing Active Linkage, it does not tell you the percentages of Active Linkage.
We are experienced Beta Glucan wholesalers and factually know beta glucan product's Active Linkage ranges from 18% to 88%, with the majority being 70% or less. This is also confirmed by the JANA study ranking the Commercially Available products at the left.