TL;DR — Key Takeaways
- Inflammation isn't just switched on and off. It's actively resolved by a cleanup process your body runs after every workout, injury, or stretch of stress.
- Neutrophils attack first and fast, but their chemical arsenal damages healthy tissue if they linger.
- Macrophages clear the debris through efferocytosis ("carrying to the grave"), letting repair begin.
- Specialized pro-resolving mediators (SPMs) — resolvins, protectins, and maresins — are the signals that tell neutrophils to stand down and macrophages to clean up.
- Your body makes SPMs from omega-3 fatty acids. HRV+ pairs omega-3s with pre-formed pro-resolving compounds and CBDA to support this signaling pathway.
What actually resolves inflammation after a hard workout?
When you tear muscle fiber in a hard session, your body doesn't just wait for the swelling to fade. It runs an active, coordinated cleanup: first-responder immune cells attack the damage, a second wave clears the debris, and a family of lipid signals called specialized pro-resolving mediators (SPMs) manages the handoff between the two. When that resolution phase runs smoothly, you recover. When it stalls, inflammation lingers and becomes chronic. Below is exactly how the process works — and where omega-3s fit in.
Neutrophils: the first responders that work rough
When a splinter breaks your skin or a training session tears muscle fiber, the first responders on the scene are neutrophils — white blood cells that rush to the site of damage within minutes to attack invading bacteria and clear away injured tissue.
Neutrophils work fast and they work rough. They release enzymes and reactive molecules that kill pathogens, but the same chemical arsenal damages surrounding healthy tissue if it lingers too long. A short, well-controlled wave of neutrophil activity is part of normal healing. A wave that keeps building without a stop signal is what turns an injury into chronic inflammation — the low-grade, ongoing immune activation researchers now link to slower recovery and long-term tissue damage.
Neutrophil infiltration: the movement of neutrophils out of the bloodstream and into damaged tissue. Too much of it prolongs damage.
What is efferocytosis? The stop signal comes from macrophages
The stop signal comes from a different cell type. Macrophages — larger immune cells that arrive after the initial neutrophil surge — perform a process called efferocytosis: the clearance of dead and dying cells from a wound site.
Efferocytosis: from the Latin for carrying to the grave. Macrophages engulf spent neutrophils, cellular debris, and damaged tissue, clearing the field so repair can begin.
Charles Serhan and colleagues at Harvard, working across two decades of animal and cell-culture studies, identified the molecular signals that govern this handoff from attack to cleanup. Their work — built on laboratory research rather than large human trials — established that a family of lipid signaling molecules called specialized pro-resolving mediators (SPMs) actively directs the transition (Serhan, Nature, 2014; Nature Reviews Immunology, 2016).
What are SPMs? Resolvins, protectins, and maresins
SPMs include resolvins, protectins, and maresins, and they do two things at once:
- They cap the damage. SPMs limit how many additional neutrophils cross into tissue (neutrophil infiltration), reducing collateral harm from the initial immune response.
- They accelerate the cleanup. SPMs stimulate macrophages to increase their rate of phagocytosis — the physical engulfing and digestion of debris and dead cells.
Phagocytosis: the process by which a cell engulfs and digests debris or other cells.
Serhan's laboratory research, published across multiple peer-reviewed papers and largely consistent in animal models, shows SPMs binding to specific receptors on macrophages that switch on this cleanup behavior (JCI, 2018; Fredman, Immunological Reviews, 2023).
Human clinical-trial data on SPM supplementation remains more limited than the underlying cell and animal science. So the mechanism is well established in the lab, while its full effect on human recovery timelines is still an active area of research.
Neutrophils vs. macrophages: the two crews
| Neutrophils | Macrophages | |
|---|---|---|
| Role | First responders / attack | Cleanup / repair prep |
| Timing | Within minutes | After the neutrophil surge |
| Action | Kill pathogens, clear injured tissue | Efferocytosis — engulf debris & dead cells |
| Risk if unmanaged | Damage healthy tissue, drive chronic inflammation | — |
| Directed by SPMs? | Yes — SPMs limit their infiltration | Yes — SPMs boost their phagocytosis |
The construction-site analogy
Picture a construction site after a demolition. The wrecking crew — your neutrophils — does necessary work but leaves rubble everywhere. If nobody hauls the rubble away, no new building goes up.
Macrophages are the haul-away crew. SPMs are the site manager, calling the shots on when the wrecking crew stands down and when the trucks start loading debris. Without that site manager, the rubble sits, the demolition crew keeps swinging, and the lot never becomes anything new.
This is why researchers describe unresolved inflammation as an active biological failure state — not simply the absence of healing.
Can you support your body's SPM production?
Your body already runs this cleanup crew every day — after every workout, every minor injury, every stretch of high stress. The raw material it converts into SPMs is omega-3 fatty acids.
HRV+ was built around this exact biology. The formula pairs omega-3 fatty acids (the precursors your body converts into SPMs) with pre-formed pro-resolving compounds and CBDA, giving your system more of the signaling tools involved in this pathway. HRV+ is designed to support the biological signaling that helps this resolution process run smoothly.
Frequently asked questions
What are specialized pro-resolving mediators (SPMs)? SPMs are a family of lipid signaling molecules — including resolvins, protectins, and maresins — that your body makes from omega-3 fatty acids. They actively direct the resolution of inflammation by limiting neutrophil infiltration and stimulating macrophage cleanup.
What is efferocytosis? Efferocytosis is the process by which macrophages engulf and clear dead and dying cells from a wound site. The term comes from the Latin for "carrying to the grave."
How are omega-3s related to inflammation resolution? Omega-3 fatty acids are the raw material your body converts into SPMs, the signals that help switch inflammation from its attack phase to its cleanup and repair phase.
Is chronic inflammation just inflammation that won't go away? Researchers describe unresolved inflammation as an active biological failure state — the resolution signals never fully engage — rather than simply the absence of healing.
Does HRV+ treat inflammation? No. HRV+ is a supplement designed to support the body's natural pro-resolving signaling pathway. It is not intended to diagnose, treat, cure, or prevent any disease.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.