How to Get Rid of an Infection Naturally

Your body already runs one of the most effective infection-fighting systems in nature, and the best “natural” strategies work by supporting that system rather than replacing it. Adequate sleep, targeted nutrients like vitamin C and zinc, certain herbal preparations, and simple measures like saltwater gargles all have peer-reviewed evidence behind them. But “natural” has limits that matter: some infections escalate fast, and delaying appropriate medical treatment for sepsis, for example, can increase mortality several-fold. Understanding which approaches genuinely help, which are overhyped, and when to stop experimenting and call a doctor is the difference between smart self-care and a dangerous gamble.

How Your Immune System Already Fights Infection

Before reaching for any remedy, it helps to know what your body is already doing the moment a pathogen gets in. Your innate immune system acts within minutes. Specialized cells called neutrophils and macrophages physically engulf and destroy bacteria, fungi, and virus-infected cells through a process called phagocytosis. A network of more than 30 proteins known as the complement system tags invaders for destruction, making it easier for those immune cells to recognize and clear them.¹ This first wave of defense works remarkably well against many common infections without any outside help.

One of the more clever tactics your body uses is starving pathogens of iron. Most bacteria need iron to grow, so during an infection your body ramps up production of a hormone called hepcidin, which locks iron inside cells and pulls it out of the bloodstream.² This “nutritional immunity” is why you often lose your appetite when you’re sick and why taking iron supplements during an active bacterial infection can sometimes do more harm than good.³ Your body is deliberately creating a hostile environment for the invader.

Let Your Fever Work

The instinct to immediately suppress a fever is understandable, but fever exists for a reason. Elevated body temperature enhances nearly every arm of your immune response: immune cells move faster, engulf pathogens more effectively, and produce more of the reactive molecules that kill microbes.⁴ Fever also boosts type I interferon responses, which have direct antiviral activity, and it makes rapidly dividing pathogens more vulnerable to destruction.⁴

Research has identified at least four ways fever protects you: it can directly kill or slow pathogens, it triggers protective heat shock proteins in your own cells, it forces pathogens to produce their own heat shock proteins (which actually alert your immune system to their presence), and it orchestrates the overall immune response more effectively.⁵ The fever response confers a measurable survival benefit during infection.⁶

This doesn’t mean you should tough out a dangerously high fever or avoid medication if you’re miserable. A moderate fever in the range most people experience with a cold or flu, though, is doing real work. If you’re otherwise healthy and the fever isn’t extreme, letting it run its course for a while before reaching for acetaminophen or ibuprofen may give your immune system an edge.

Nutrients That Actually Help Your Immune System

Three micronutrients stand out for having genuine, well-documented roles in immune defense: vitamin C, vitamin D, and zinc. These aren’t miracle cures, but if you’re deficient in any of them, your immune system is fighting with one hand tied behind its back.

Vitamin C

Vitamin C concentrates in immune cells, particularly the neutrophils that serve as your body’s first responders. It enhances their ability to migrate toward infection sites, engulf pathogens, and produce the reactive oxygen species that destroy microbes.⁷ Your vitamin C stores deplete rapidly during an active infection as your immune cells burn through their supply, so maintaining adequate intake during illness matters more than usual. Citrus fruits, bell peppers, kiwi, and berries are all rich sources, though supplementation is reasonable during an infection if your diet falls short.

Vitamin D

Vitamin D does something more specific than generally “boosting” immunity. It triggers the production of cathelicidin, an antimicrobial protein that punctures bacterial membranes and helps clear intracellular pathogens.⁸ This vitamin D-cathelicidin pathway also activates autophagy, the cellular recycling process that helps your cells destroy pathogens hiding inside them. Lab research has shown that vitamin D-stimulated cathelicidin production can restrict viral infection in immune cells, including reducing the proportion of cells infected by viruses like Zika.⁹ Given that vitamin D deficiency is widespread, especially in winter months and among people with darker skin or limited sun exposure, checking your levels and supplementing if needed is one of the more straightforward immune investments you can make.

Zinc

Zinc has a surprisingly direct antiviral effect: it can inhibit viral replication machinery across a wide range of viruses. In lab studies, zinc interferes with viral RNA polymerase in hepatitis C, viral DNA polymerase in herpes simplex virus, and reverse transcriptase in HIV.¹⁰ When paired with compounds called zinc ionophores that help shuttle it into cells, even low doses of zinc decreased RNA synthesis in influenza, poliovirus, and SARS-CoV.¹¹ Zinc lozenges taken at the first sign of a cold remain one of the best-studied natural interventions for shortening respiratory infections. The key is starting early, within the first day of symptoms, and taking them frequently enough to maintain high zinc concentrations in the throat.

Herbal Remedies With Peer-Reviewed Evidence

Most herbal “immune boosters” have thin evidence at best. A few, however, have been tested in randomized controlled trials and show real, if modest, effects.

Echinacea

Echinacea purpurea is probably the most studied herbal immune remedy. A recent meta-analysis in children found that it significantly reduced the duration of upper respiratory infections, lowered the rate of getting sick in the first place by about a fifth, and substantially cut antibiotic use.¹² In adults, a randomized trial found that newer echinacea formulations shortened time to remission by roughly a day and a half compared to standard treatment, and viral clearance by day ten was more common in the echinacea group.¹³ Another trial looking at long-term prevention during the COVID-19 pandemic found that echinacea used during acute episodes reduced overall viral load by roughly 99% and shortened time to virus clearance by about eight days compared to control.¹⁴

The catch is that echinacea products vary enormously in quality and formulation. The species matters (purpurea has the best evidence), the plant part matters (root versus aerial parts), and the extraction method matters. A generic echinacea capsule from a drugstore shelf may or may not resemble what was used in clinical trials.

Garlic

Garlic’s antimicrobial properties come mainly from allicin, a compound released when you crush or chop a fresh clove. In its pure form, allicin is active against a wide range of bacteria (including multi-drug-resistant strains), fungi like Candida albicans, intestinal parasites, and some viruses.¹⁵ Allicin works by reacting with sulfur-containing groups on enzymes that pathogens need to function, essentially gumming up their metabolic machinery.¹⁶ It also disrupts bacterial membrane integrity and shifts the cell’s internal chemistry toward a more oxidized state that microbes struggle to survive in.¹⁷

The practical limitation is that allicin is unstable. It breaks down quickly after garlic is crushed and is largely destroyed by cooking. Eating raw garlic or using aged garlic extracts are the most common strategies, but the doses used in lab studies are difficult to replicate with food alone. Garlic is better thought of as a helpful dietary habit than a treatment for an active serious infection.

Elderberry

Black elderberry (Sambucus nigra) has become popular as a cold and flu remedy, and the evidence is more than just folk tradition. A small randomized trial found that elderberry extract relieved influenza symptoms an average of four days earlier than placebo and reduced the need for rescue medication.¹⁸ A meta-analysis of randomized controlled trials confirmed that elderberry supplementation substantially reduced upper respiratory symptoms, with a large overall effect size.¹⁹ One caution: raw elderberries contain compounds that can cause nausea and vomiting, so stick with commercially prepared syrups or lozenges rather than making your own from foraged berries.

Simple Topical and Local Remedies

Not every natural approach involves swallowing something. Two of the oldest remedies in human medicine, honey and saltwater, have solid evidence for specific uses.

Honey has documented antibacterial properties that work through multiple mechanisms: its low pH creates an acidic environment hostile to bacteria, its high sugar concentration draws water out of bacterial cells through osmosis, and it maintains a moist wound environment that promotes healing while preventing infection.²⁰ Medical-grade honey is used in wound care in hospitals around the world, and ordinary honey applied to minor cuts and skin infections can help. For sore throats, a spoonful of honey (in those over age one) is backed by enough evidence that many physicians recommend it as a first-line approach before reaching for over-the-counter remedies.

Saltwater gargling and nasal irrigation with hypertonic saline have clinical trial support for upper respiratory infections. In one study, hypertonic saline nasal irrigation reduced the duration of illness by nearly two days, cut over-the-counter medication use by about a third, reduced household transmission by about a third, and decreased viral shedding.²¹ The mechanism is straightforward: saltwater draws fluid out of swollen mucous membranes, physically flushes out viral particles, and boosts the airway’s natural clearance systems. Dehydrated airways are associated with mucus stasis and bacterial overgrowth, so keeping them moist and clear has direct antimicrobial benefits.²² You can make your own saline solution with clean water and non-iodized salt, or use pre-made sachets with a neti pot or squeeze bottle.

Probiotics and Gut Immunity

Roughly 70% of your immune system is concentrated in and around your gut, so it makes sense that the bacteria living there would influence how well you fight off infections. Probiotic bacteria interact with intestinal immune cells and the existing microbial community to help calibrate immune responses, maintaining the balance between tolerating harmless substances and attacking genuine threats.²³ Research suggests probiotics can regulate the functions of both local mucosal immune cells and systemic immune cells throughout the body.²⁴

Fermented foods like yogurt, kefir, sauerkraut, and kimchi are traditional probiotic sources. Probiotic supplements can also help, though strain specificity matters. Not all probiotics do the same thing, and a product that helps with digestive issues may not be the one that best supports respiratory immunity. If you’ve recently taken antibiotics, replenishing your gut flora with probiotics is especially worthwhile since antibiotics wipe out beneficial bacteria alongside the harmful ones.

Sleep, Stress, and Exercise

The lifestyle factors that affect your immune function are unglamorous but powerful, often more so than any supplement.

Sleep is one of the strongest. It promotes host defense against infection, and sleep deprivation alters both your first-line and long-term immune defenses, pushing your body toward a chronic inflammatory state that paradoxically makes you worse at fighting acute infections.²⁵ If you’re already fighting something, sleeping more isn’t laziness; it’s one of the most effective things you can do.

Chronic stress is equally important. Brief, acute stress can actually temporarily boost immune function, which makes evolutionary sense: if you’re in immediate danger, your body mobilizes everything it has. But ongoing stress does the opposite. Chronic stress drives persistently elevated cortisol, which over time makes immune cells resistant to cortisol’s normal anti-inflammatory signals, leading to unchecked inflammation and weakened infection-fighting capacity.²⁶ People under prolonged stress are measurably more likely to develop colds after exposure to a virus, precisely because this dysregulated inflammatory response fails to contain the infection effectively.²⁷ Meditation, breathing exercises, and even brief walks in nature aren’t just feel-good advice. They address a physiological pathway that directly impairs your ability to clear infections.

Exercise sits in an interesting place. The old idea that intense exercise opens a “window” of immune suppression has been largely debunked. The drop in circulating immune cells after a hard workout turns out to be a redistribution, not a loss. Those cells move to peripheral tissues like the lungs and gut lining, essentially deploying to the front lines rather than disappearing.²⁸ Regular physical activity is associated with lower rates of both infectious and chronic inflammatory diseases across the lifespan. That said, if you’re already sick with more than a mild head cold, rest is a better strategy than pushing through a workout.

When to Stop Trying and See a Doctor

Every natural approach described above works best for mild infections or as support alongside medical treatment. There are clear situations where relying on natural remedies alone becomes genuinely dangerous.

The clearest red line is sepsis, which occurs when your body’s response to an infection spirals out of control and starts damaging your own organs. In high-risk patients with community-onset sepsis, those who didn’t receive appropriate antibiotics early had more than three times the mortality rate of those who did.²⁹ A meta-analysis found that each hour of delay in antibiotic administration increased in-hospital mortality, and delays beyond an hour raised the odds of death by about 20%.³⁰ Research on emergency department patients found that antibiotic delays beyond 12 hours were associated with roughly three and a half times the risk of progressing to sepsis compared to receiving them within 12 hours.³¹

Warning signs that an infection needs medical attention include a fever above 103°F (39.4°C) that doesn’t respond to treatment, confusion or difficulty staying awake, rapid heartbeat or breathing at rest, severe pain that worsens rather than improves, redness and swelling that’s spreading outward from a wound, and any infection that gets significantly worse after a few days of home care.

Herb-Drug Interactions Worth Knowing About

If you’re taking prescription medications, mixing in herbal remedies isn’t always harmless. Many herbs and supplements can inhibit the liver enzymes that metabolize drugs, changing how much active medication ends up in your bloodstream. This can either make the drug less effective or push its concentration to toxic levels. Some of these interactions can even cause liver damage.³²

St. John’s wort is one of the most well-known offenders. It accelerates the breakdown of many medications, including oral contraceptives, blood thinners, and some HIV drugs, potentially rendering them ineffective. Garlic supplements (as opposed to culinary amounts) can amplify the effects of blood-thinning medications. Echinacea may interact with immunosuppressant drugs, which matters enormously for transplant recipients or people with autoimmune conditions. If you’re on any long-term medication, checking with a pharmacist before adding herbal supplements is a step worth taking, even if the supplement itself is perfectly safe on its own.

The broader principle is worth keeping in mind: “natural” doesn’t automatically mean “safe,” and it certainly doesn’t mean “won’t interact with anything else.” Aspirin is derived from willow bark. Digitalis came from foxglove. Plenty of natural compounds are pharmacologically potent, which is exactly why some of them work and exactly why some of them require caution.