Question explored with the scientific record
Conversation so far
- 1 what is naltrexone for/do? + a private exchange
- 2 what about use in long covid? + a private exchange
- 3 wgat does CoQ10 400mg do + a private exchange
- 4 Nattokinase what does it do?
- 5 and for long covid?
Answered on this page ↓
and for long covid?
For long COVID, nattokinase is a plausible idea with no human outcome data behind it. The microclot story is real in a dish, not in patients.
The theory is that long COVID involves persistent microclots, tiny abnormal protein clumps that block small vessels. In a lab dish, nattokinase broke down these microclots and slowed new ones forming, in rough proportion to dose [1]. That is a real finding about an enzyme and a protein in a dish. It is not a finding about a person.
A second lab study undercut the enthusiasm. Without ultrasound, nattokinase alone showed no significant reduction in microclots versus control [2]. The clot disruption came mostly from the ultrasound itself, and nattokinase added little [2].
The human record is thin. A review notes nattokinase has profibrinolytic and antithrombotic activity in preclinical and limited human studies, but lacks phase III trials and carries bleeding risk [3]. The human studies it cites are about atherosclerosis and post-flight clots, not long COVID [3]. Nothing here measures long COVID symptoms, fatigue, or recovery.
| Question | What the evidence shows |
|---|---|
| Does it break microclots? | Yes, in a dish [1] |
| Alone, without ultrasound? | No significant effect [2] |
| Does it help long COVID patients? | Not tested here |
| Bleeding risk quantified? | No [3] |
My call: the mechanism is interesting and unproven in people, and the one lab study that tested nattokinase alone found nothing [2]. Do not take it expecting to fix long COVID. Confidence: low.
Sources used 3
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Automated, Microscopic Measurement of Fibrinaloid Microclots and Their Degradation by Nattokinase, the Main Natto Protease
Recombinant nattokinase degraded ThT-positive fibrinaloid microclots in vitro, and automated fluorescence microscopy tracked microclot number, intensity, and size over time.
DOI: 10.62767/jecacm504.6557 -
Investigation of the Synergistic Effect of Enzymatic and Ultrasound-Induced Amyloid Microclot Degradation
This study investigates whether low-frequency ultrasound with microbubbles can mechanically disrupt amyloid microclots in vitro and whether fibrinolytic enzymes (rtPA, lumbrokinase, nattokinase) provide any synergistic enhancement, finding that ultrasound-driven mechanical force…
DOI: 10.1101/2025.09.12.675963 -
Nattokinase historical sketch on experimental and clinical evidence
Nattokinase shows profibrinolytic and antithrombotic activity in preclinical and limited human studies but lacks phase III trials and carries bleeding risk.
DOI: 10.4081/itjm.2023.1583