You cannot remove botulism-causing spores from honey through any normal home or commercial process. The spores survive pasteurization, boiling, and even the naturally antimicrobial environment of honey itself. Prevention comes down to two things: never feeding honey to babies under 12 months, and following strict safety practices if you make infused honey products at home.
Why Honey Contains Botulism Spores
Honey can contain spores of the bacterium that causes botulism. Bees pick up these spores from soil, dust, and plant material during foraging, and the spores end up in the finished honey. Unlike most bacteria, these spores are extraordinarily tough. They’re among the most heat-resistant spores of any disease-causing organism, requiring temperatures of about 250°F (121°C) sustained for at least 3 minutes to achieve what food scientists call a “botulinum cook,” the standard used for commercial sterilization of canned foods. Standard honey pasteurization doesn’t come close to this. It destroys the active (vegetative) bacterial cells but leaves spores completely intact.
This means raw honey, pasteurized honey, filtered honey, and organic honey all carry the same potential risk. No brand or processing method eliminates spores from honey sold for everyday use.
Why Adults Can Eat Honey Safely
Healthy adults swallow botulism spores regularly, not just from honey but from many foods, and nothing happens. The reason is gut bacteria. A mature intestinal microbiome, rich in protective species like Lactobacilli, effectively blocks the spores from taking hold and producing toxin. Mouse studies dating back to 1979 confirmed this: germ-free mice and mice given antibiotics became vulnerable to botulism colonization, while mice with normal gut bacteria did not.
Adults with severely compromised gut flora (from prolonged antibiotic use, intestinal surgery, or certain gastrointestinal conditions) can, in rare cases, develop what’s called adult intestinal colonization botulism. But for the vast majority of people, a healthy gut handles these spores without issue.
Why Infants Are Vulnerable
Babies under one year old lack the diverse, established gut bacteria that block spore germination. Their intestinal microbiome is still developing, leaving gaps where botulism spores can colonize, multiply, and produce toxin directly inside the gut. Infant botulism is now the most common form of botulism in the United States and Canada.
The highest-risk window falls between three and five months of age, a period that coincides with shifts in gut bacteria as babies transition from breast milk to solid foods. Cases have been documented in infants younger than one week old, though. Research published in Current Microbiology found that infants with confirmed botulism had significantly more of certain harmful bacterial groups in their guts and fewer protective bacteria compared to healthy infants. Breast milk appears to help shape a more protective microbiome, potentially delaying colonization or limiting toxin absorption, but it doesn’t eliminate the risk entirely.
The CDC is clear: do not give honey to any child younger than 12 months. This includes honey mixed into food, water, formula, or applied to a pacifier. After 12 months, the gut microbiome is typically mature enough to handle any spores present.
Signs of Infant Botulism
If a baby has been exposed to honey (or develops symptoms without a known cause, since honey isn’t the only source of spores), the earliest sign is usually constipation. This can appear before other symptoms and is easy to overlook. As the toxin spreads, it blocks nerve signals to muscles, producing a characteristic pattern:
- Poor feeding with a noticeably weak suck
- Weak or altered cry that sounds different from normal
- Drooping eyelids and a flattened facial expression
- Floppy muscle tone, where the baby feels limp when held
- Diminished gag reflex
- Breathing difficulty, which can progress to respiratory failure
These symptoms typically descend from the head downward, affecting facial muscles first and then spreading to the body. Infant botulism is a medical emergency. If you notice these signs, especially constipation followed by sudden weakness or difficulty feeding, get to an emergency room immediately.
Preventing Botulism in Infused Honey
The other common concern involves homemade infused honey, where garlic, herbs, or other ingredients are added to honey and stored at room temperature. This creates a real risk even for adults. Fresh produce like garlic cloves and herbs can carry botulism spores on their surface, and submerging them in honey creates the low-oxygen environment these bacteria need to produce toxin.
To reduce the risk, food safety experts at NC State recommend several steps. First, wash all produce and use only unblemished fruits, vegetables, or herbs, since bruised or scraped surfaces are more likely to harbor bacteria. Before adding ingredients to honey, soak them in a citric acid solution strong enough to bring their pH below 4.2 within 24 hours. This acidification step destroys bacteria that may be present. Heat the honey to 180°F (82°C) before combining it with other ingredients. Sterilize your bottles or jars by washing and boiling them for 10 minutes.
If you skip the acidification step, refrigerate the infused honey and throw it away within four days. Alternatively, freeze it until you’re ready to use it. Room-temperature storage of infused honey without proper acidification is genuinely dangerous, not just a theoretical concern. Standard botulism toxin is odorless and tasteless, so you won’t be able to tell by looking at or smelling the product.
What Doesn’t Work
Several common assumptions about honey safety are wrong. Pasteurized honey is not spore-free. Heating honey on your stovetop won’t reach the temperatures needed to destroy spores. Organic or locally sourced honey carries the same spore risk as conventional honey, since the spores come from the natural environment bees forage in. Filtering honey removes debris but not microscopic spores. And while honey’s high sugar content and low moisture prevent most bacteria from growing inside the jar, botulism spores can survive in a dormant state indefinitely under these conditions, only becoming dangerous when they encounter the right environment (like an infant’s gut or an oxygen-free infusion).
The practical takeaway is straightforward: honey itself is safe for anyone over 12 months with a healthy gut. The risk lives in two specific situations, feeding it to infants and making improperly stored infused products, and both are entirely preventable.