MAOIs on Your Supplement Shelf: What to Know Before a Ceremony or Psychedelic Experience

Some supplements contain mild MAOI activity or raise serotonin levels significantly enough to matter before a psychedelic experience. The problem is the labels don't say MAOI. They say passionflower extract, St John's Wort, or relaxation blend.

This is a guide to the supplements worth knowing about before a ceremony or psychedelic experience: what to pause, for how long, what to keep, and what to think about during the integration period after.

What an MAOI is and why it matters here

MAOIs, or monoamine oxidase inhibitors, block the enzyme that breaks down serotonin, dopamine, and other monoamines in the body. Ayahuasca uses this deliberately: the harmala alkaloids in the vine inhibit MAO so that DMT from the chacruna plant becomes orally active.

When you bring additional MAOI activity from supplements into that system, you risk amplifying the experience far beyond what you expected. More seriously, you can push serotonin levels to a dangerous point. This is called serotonin syndrome.

Serotonin syndrome ranges from mild (agitation, rapid heart rate, sweating, shivering) to severe (muscle rigidity, high fever, seizures). The severe end is a medical emergency.

Even outside of ayahuasca contexts, combining MAOI-active substances with serotonin-raising compounds is a risk worth understanding.

The supplements most people miss

St John's Wort

This is the one that matters most. St John's Wort has well-documented MAOI activity via hyperforin and other constituents. It is sold in every health food shop as a supplement for low mood and stress. Most people don't connect it to ceremonial work because it looks ordinary.

Washout: at least two weeks before an ayahuasca ceremony. If you have been taking a high dose for several months, two weeks is a minimum, not a guarantee. Discuss with your facilitator.

Passionflower

Passionflower (Passiflora incarnata) contains harman and norharman, alkaloids with mild reversible MAOI activity. It appears frequently in sleep supplements, stress blends, and calming teas. The activity is weaker than St John's Wort, but real.

If your sleep or stress supplement contains passionflower, pause it for one to two weeks before a ceremony. Check the label: it is often buried in a proprietary blend.

Syrian rue

Peganum harmala, known as Syrian rue, contains harmaline and harmine, which are strong reversible MAOIs. Some people take it intentionally as part of a preparation or standalone experience. If you have been using it regularly outside a ceremony context, tell your facilitator before your next one.

High-dose curcumin extracts

Standard turmeric in food is not a concern. High-dose standardised curcumin extracts, typically 500 mg to 1500 mg of curcumin per capsule, have shown some MAO inhibitory activity in animal studies. Human evidence is limited. That said, if you are taking a high-dose curcumin supplement, pausing it in the week before a ceremony is a reasonable precaution.

The serotonin side: what matters for MDMA and psilocybin contexts

Even if your supplements have no MAOI activity, some raise serotonin production directly. This matters most for MDMA-assisted experiences, where serotonin release is the primary mechanism and the system is already running high. It is worth knowing for psilocybin contexts too.

5-HTP

5-HTP is a direct serotonin precursor. It converts to serotonin in the brain and body. Many people take it for sleep or mood support. Combining it with a serotonin-releasing compound raises the risk significantly.

Washout before psilocybin: at least 24 hours. Washout before MDMA: at least 48 to 72 hours. Equally important: do not take 5-HTP in the two to three days immediately after MDMA, when serotonin is depleted and the system is sensitive to overshoot.

SAMe

S-adenosylmethionine (SAMe) is involved in methylation throughout the body. It raises serotonin, dopamine, and norepinephrine. Some people take it for mood or joint support. Pause it for at least one to two weeks before a ceremony.

High-dose tryptophan

Tryptophan converts to 5-HTP and then to serotonin. At dietary levels in food, this is not a concern. At supplement doses of 1000 mg or more, the same caution as 5-HTP applies.

Mucuna pruriens

Mucuna is primarily a dopamine precursor via L-DOPA, not a serotonin one. It is lower risk than 5-HTP for serotonin syndrome. It is still worth flagging with your facilitator if you take it regularly.

What you don't need to pause

People often strip their supplement routine too far before a ceremony and arrive depleted. The following are not a concern and can continue through preparation:

• Magnesium (glycinate, malate, threonate, or citrate)
• Omega-3 (fish oil or algae oil)
• Vitamin D and K2
• Vitamin C
• B vitamins, including methylated forms such as methylcobalamin and methylfolate
• Zinc
• Probiotics
• Lion's mane mushroom
• Rhodiola rosea

Ashwagandha is generally considered safe to continue, though some facilitators prefer you pause it for the week before. Check with yours.

The list of things genuinely worth pausing is short. Most of your routine can stay in place.

The integration period

The days after a ceremony are worth thinking about as carefully as the preparation.

Wait before reintroducing 5-HTP or tryptophan. After an ayahuasca ceremony, the nervous system is often in a sensitive state. Give it at least two to three days before bringing serotonin-active supplements back.

Magnesium and B vitamins support integration. They support the nervous system without adding serotonergic or MAOI activity. These are among the best things to lean on post-ceremony.

Restart St John's Wort only once the integration window has closed. Most facilitators suggest at least a week after a ceremony before restarting, and often longer depending on the experience.

A note on prescribed medications

If you take a prescribed SSRI, SNRI, tricyclic antidepressant, or any prescription MAOI, this article is not sufficient guidance. The interactions are more serious and more individual than supplement interactions.

Speak to your prescribing doctor and your facilitator before any psychedelic experience. This is not an area to navigate with general information alone.

The supplement interactions above can be managed with preparation and clear information. Prescription medication interactions require medical oversight.

How Stack Almanac can help

If you use Stack Almanac, you can enter your current supplement routine and the Almanac Advisor will flag which ones have known interactions with MAOIs or serotonin-raising compounds. You can see what is worth pausing, and why, before you need to make any decisions.