Wondering whether serrapeptase should become a second bottle beside nattokinase? Learn how FU and SPU differ, what is inside Doctor's Best Natto-Serra, and why separate enzyme supplements are not automatically equivalent to one combined formula.
Nattozimes and nattokinase can look interchangeable when one label shows 6,750 FU and another shows 2,000 FU, but the active ingredients are different. Here is how to read the names, source organisms and FU activity before choosing a nattokinase product in NZ.
Searching for nattokinase 4000 FU in NZ? Before comparing bottles, check whether the FU figure is per capsule or per serving. See how our current Doctor's Best, NOW and Swanson nattokinase labels differ, plus the safety details that matter.
