A handful of supplements have evidence supporting their use for body odor, with chlorophyllin copper complex being the only one the FDA formally recognizes as an internal deodorizer. Beyond that, zinc, probiotics, and certain B vitamins each target different parts of the odor equation, from the bacteria on your skin to the way your body processes smelly compounds. The right choice depends on what’s driving your odor in the first place.
Chlorophyllin: The Only FDA-Recognized Option
Chlorophyllin copper complex, a water-soluble derivative of chlorophyll, is the supplement with the strongest regulatory backing for body odor. The FDA classifies it as a generally recognized safe and effective over-the-counter internal deodorizer. Its approved uses are specifically to reduce odor from colostomies, ileostomies, and fecal incontinence, but many people take it for general body odor as well.
You’ll find chlorophyllin sold as “liquid chlorophyll” drops or soft gel capsules at most supplement retailers. The exact mechanism isn’t fully understood, but it appears to neutralize odor-causing compounds internally before they reach your skin or breath. Side effects are mild for most people: expect green-tinted urine and stools, possible stomach upset, and increased sun sensitivity. That last one matters. If you start taking chlorophyllin, wearing sunscreen becomes more important because the supplement can make your skin more prone to burns.
There’s no universally agreed-upon dose. Products typically range from 100 to 200 mg per day, but the science hasn’t pinned down an optimal amount. Starting at the lower end and adjusting is a reasonable approach.
Zinc’s Role in Skin and Odor
Zinc has a direct and somewhat surprising connection to body odor. The bacteria most responsible for underarm smell, primarily Corynebacterium species, use a zinc-dependent enzyme to break down odorless compounds in your sweat into the volatile molecules you actually smell. Specifically, these bacteria release an enzyme called N-AGA that cleaves glutamine conjugates in armpit secretions, producing the characteristic acids behind underarm odor.
This creates an interesting paradox: zinc fuels the bacterial enzyme that creates odor, yet zinc applied topically (as in many natural deodorants) can also suppress bacterial growth on skin. For oral supplementation, the picture is less clear-cut. Research confirms that zinc ions can directly bind hydrogen sulfide, one of the main compounds behind bad breath and certain body odors, and can suppress the growth of odor-producing bacteria. But most of that evidence comes from oral malodor studies rather than whole-body odor trials.
If you suspect a zinc deficiency is contributing to changes in your body odor, correcting the deficiency through supplementation could help normalize your sweat composition. Signs of low zinc include slow wound healing, frequent infections, and changes in taste or smell.
Probiotics: Changing the Bacteria That Cause Smell
Body odor isn’t really about sweat itself. It’s about what bacteria do to your sweat. That makes the bacterial balance on your skin a major factor, and probiotics are one way to shift it.
The most direct evidence comes from topical probiotic creams rather than oral supplements. A study published in the Journal of Cosmetic Dermatology tested a cream containing Lactiplantibacillus pentosus KCA1 applied to the underarms. After use, the two bacterial groups most responsible for armpit odor, Staphylococcus and Corynebacterium, were significantly reduced in abundance. Interestingly, lactobacilli were detected in the armpits of over 80% of both male and female subjects, suggesting these beneficial bacteria are a natural part of the underarm ecosystem, just in low numbers.
Oral probiotics take a more indirect route. They influence body odor through the gut, where bacterial imbalances can produce excess volatile compounds that eventually exit through your skin and breath. If your odor has a gut component (you notice it worsens with digestive issues, for instance), a general probiotic containing Lactobacillus or Bifidobacterium strains may help over several weeks. The topical approach, though, appears to work faster and more directly for underarm odor specifically.
Vitamin B2 for Metabolic Odor Conditions
Some people produce a persistent fishy body odor that no amount of showering or deodorant can fix. This often points to trimethylaminuria, sometimes called fish odor syndrome, a condition where the body can’t properly break down trimethylamine (TMA), a compound produced during digestion of certain foods. TMA then accumulates and is released through sweat, breath, and urine.
Riboflavin, or vitamin B2, acts as a cofactor for the liver enzyme responsible for converting TMA into an odorless form. In documented cases, doses of 200 mg per day (split into two 100 mg doses) have reduced TMA excretion without requiring dietary changes. This is a targeted intervention for a specific metabolic issue, not a general body odor fix. But if your odor has a distinctly fishy quality that persists regardless of hygiene, it’s worth exploring with a healthcare provider who can test your TMA levels.
Supplements That Can Make Odor Worse
While searching for supplements that reduce odor, it’s worth knowing which ones can create new smells. Fenugreek is the most notable example. It contains a compound called sotolon that passes through the body unchanged and comes out in sweat and urine, producing a strong maple syrup-like scent. People taking fenugreek for blood sugar management or lactation are sometimes told to increase the dose until they can smell it on their skin, which gives you a sense of how potent the effect is. Breastfed babies can even pick up the scent, occasionally triggering false concerns about maple syrup urine disease.
Other supplements known to alter body odor include high-dose fish oil (which can produce a fishy smell as your body processes omega-3 fatty acids), choline supplements, and garlic extract. If you’re already dealing with body odor, check whether anything in your current supplement stack might be contributing before adding something new.
Activated Charcoal for Odor From the Inside
Activated charcoal binds to a wide range of compounds in the digestive tract, and there’s experimental evidence that it reduces foul odors. In a blinded study testing charcoal against putrefied tissue, activated charcoal produced a statistically significant reduction in odor, both on its own and combined with baking soda. The researchers recommended it as an inexpensive option for odor associated with extensive skin conditions.
For everyday body odor, the logic is that charcoal traps odor-producing compounds in your gut before they can be absorbed and released through your skin. The catch is that charcoal is indiscriminate. It also binds medications, vitamins, and nutrients, so you need to take it at least two hours apart from anything else. It can also cause constipation and black stools. It works best as a short-term tool rather than a daily habit.
Magnesium and Sweat Composition
Magnesium doesn’t directly neutralize odor, but it plays a background role in how your body handles sweat. Your kidneys typically excrete about 100 mg of magnesium per day, and losses through sweat are normally low. During intense exercise, though, sweat-based magnesium losses increase considerably. Since magnesium is involved in hundreds of enzymatic reactions, including those that regulate stress hormones and nervous system function, a deficiency could indirectly worsen odor by increasing stress-related sweating or altering sweat composition.
If you exercise heavily, sweat a lot, or have other signs of magnesium deficiency (muscle cramps, poor sleep, anxiety), correcting the deficiency may help normalize your sweat. It’s not a direct deodorizer, but it addresses one of the underlying factors that can shift your body chemistry toward stronger odor.
What to Expect and How Long It Takes
Supplements that work internally need time to shift your body chemistry. There’s no well-established timeline in the research for most of these options, but a reasonable expectation is two to four weeks of consistent use before judging results. Chlorophyllin tends to show effects sooner because it works on odor compounds directly in the gut. Probiotics, whether oral or topical, need time to shift bacterial populations. Zinc and magnesium corrections depend on how depleted you are, since replenishing a true deficiency can take several weeks.
Keep in mind that persistent or sudden changes in body odor can signal underlying health issues, from hormonal shifts to liver or kidney problems. Supplements are a reasonable first step for mild, general odor concerns, but odor that is unusually strong, new, or has a distinct character (fishy, fruity, ammonia-like) deserves a closer look at the root cause rather than just masking it.