What happens when you take cacao with MAOIs?
Cacao is the unprocessed seed of Theobroma cacao, the same plant that gives us chocolate. Standard commercial chocolate is fermented, dried, roasted, and conched, processes that significantly degrade the biogenic amines present in the raw bean. Raw cacao — sold as raw cacao nibs, raw cacao paste, or ceremonial cacao drinks — skips most of that. Analytical studies of cocoa beans have shown that tyramine is the most abundant amine in raw cacao, followed by tryptamine and 2-phenylethylamine, while roasting shifts the profile but does not eliminate amines entirely.
Monoamine oxidase inhibitors (MAOIs) such as phenelzine, tranylcypromine, isocarboxazid, and high-dose selegiline permanently disable the MAO-A and MAO-B enzymes that would normally break those amines down in the gut and liver. When raw cacao reaches the bloodstream intact, tyramine displaces stored norepinephrine from sympathetic nerves, producing a sudden hypertensive response — the classic "cheese reaction." Symptoms include a pounding occipital headache, palpitations, sweating, neck stiffness, and in severe cases hypertensive emergency with stroke risk.
Raw cacao also contains small amounts of serotonin and tryptamine, which on a non-selective MAOI can theoretically contribute to serotonin syndrome, especially if the patient is on additional serotonergic agents.
Why is this important?
Ceremonial cacao has become popular in wellness circles, often consumed in 30–50 g servings as a hot drink. That is a much larger dose of unprocessed cacao than a person eating standard chocolate would ever encounter. A 40 g ceremonial cacao drink delivers a much larger tyramine load than a 40 g piece of commercial dark chocolate.
Patients often do not realize that "raw cacao," "cacao paste," "cacao butter," and "ceremonial-grade cacao" can carry biogenic amine loads similar to other restricted MAOI foods. The advisory printed with MAOI prescriptions usually says only "chocolate in moderation" — a phrasing that predates the recent ceremonial cacao trend and may give a false sense of safety.
Risk depends heavily on the type of MAOI. Irreversible non-selective MAOIs are the highest risk. Moclobemide (a reversible MAO-A inhibitor) is much safer because tyramine can compete it off the enzyme. Transdermal selegiline (Emsam) at 6 mg/24 h targets brain MAO-B preferentially and bypasses the gut, so dietary restrictions are not needed at that dose; 9 and 12 mg/24 h doses do require restrictions.
What should you do?
If you take an irreversible MAOI or a high-dose selegiline patch, treat raw cacao the same way you treat aged cheese, cured sausage, or tap beer — avoid it. That includes:
- Ceremonial cacao drinks (40–50 g paste in hot water)
- Raw cacao nibs in trail mix, smoothies, or granola
- Raw cacao powder in beverages and recipes
- Raw cacao paste, butter, or bars sold by raw-food brands
Processed dark chocolate in small servings is generally far safer than raw cacao at the same weight, but it is still on the moderate-caution list. Ask your prescriber for written guidance on amounts you can tolerate.
If you develop a severe pounding headache, palpitations, neck stiffness, profuse sweating, or chest pain after consuming cacao, call emergency services. Hypertensive crisis on an MAOI can progress to stroke or myocardial infarction in minutes, and over-the-counter decongestants will make it worse.
Which specific products are affected?
The highest-risk cacao products are:
- Ceremonial cacao (Guayusa, Keith's, Soul Lift, Ora, and similar brands)
- Raw cacao paste and raw cacao bars
- Raw cacao nibs and raw cacao powder
- Unfermented or minimally fermented cacao products
Processed dark chocolate (Lindt 70%, Ghirardelli, etc.) is lower-risk because the standard fermentation, roasting, and conching steps reduce — though do not eliminate — biogenic amines. Cocoa butter, used in white chocolate and as a cooking fat, contains negligible amounts.
The MAOIs of concern are phenelzine (Nardil), tranylcypromine (Parnate), isocarboxazid (Marplan), and selegiline (Emsam) at 9 or 12 mg/24 h. Moclobemide, low-dose selegiline patches, and the antibiotic linezolid carry lower but non-zero risk.
The bottom line
Raw cacao — especially in ceremonial-style servings — carries a meaningfully higher tyramine and biogenic amine load than processed chocolate. On irreversible MAOIs, that load is enough to trigger a hypertensive reaction. Avoid raw cacao products entirely while on MAOI therapy, keep processed chocolate to small servings, and seek emergency care for severe headache, palpitations, or chest pain after any cacao exposure. When in doubt, ask your prescriber rather than experimenting.