On the patient the heat wave overwhelmed

A patient sits across from you at the end of July. She has just returned from a hot yoga retreat in a humid state. On day three she overheated. Her core temperature climbed. Her heart rate would not settle for hours after. She was not hospitalized, but she is not right. Her digestion has been off since — loose, sensitive, unlike her — and she is not sure she connects it to the heat.

This is the pattern the summer classics wrote for. Nine hundred years ago in the Song dynasty, the compilers of the Taiping Huimin Heji Jufang set down a formula for the illness that comes when heat and damp overwhelm the middle. They called it Huo Xiang Zheng Qi — the Agastache Formula for Rectifying Qi. A Chinese research team has now studied its effects against exertional heat stroke, and published the work in Frontiers in Pharmacology.

The formula.

Eleven herbs. Huo Xiang, the aromatic Agastache leaf, chief among them. Together they aromatically transform damp, harmonize the middle burner, and lightly disperse the exterior — the classical way of naming what modern physiology now describes at the barrier layer.

It is in our Atone.

Where these herbs come from.

The Huo Xiang in Atone is selected for a high leaf-to-stem ratio — the aromatic oils that do the work concentrate in the leaves. Our Zi Su, the perilla leaf, is wildcrafted from the Xinjiang region. Every herb in the tea is sulfur-free — a distinction that matters more than practitioners often realize, because sulfur fumigation is common in the commercial supply chain and quietly degrades the volatile compounds the formula depends on.

The barrier finding.

Heat stroke, the modern physiology now understands, does not first fail at the heart or the brain. It first fails at the gut. The intestinal barrier disrupts under thermal stress, and the multi-organ injury that follows is downstream of that first failure. Huo Xiang Zheng Qi preserved the barrier. The barrier proteins that hold the gut lining cells to each other — ZO-1, Occludin, E-cadherin — remained intact. Electron microscopy confirmed the tight junction structures were preserved. The formula held the gate.

What else changed.

The core body temperature climbed less. The onset of heat stroke was delayed. The signs of multi-organ injury softened across biochemical and histopathological markers. The MAPK and NF-κB inflammation pathways — which heat stress ordinarily throws wide open — were held quieter. The gut microbiome shifted: beneficial Lactococcus rose, harmful Streptococcus fell.

What this means.

Nine hundred years ago the classics named a pattern: summer heat and damp overwhelming the middle, causing the body to lose its rectifying capacity. The modern description now available: a heat-driven collapse of the intestinal barrier, followed by inflamation cascading to distant organs. Both are describing the same architecture at different scales. The formula preserves the gate the classical language was pointing at all along.

What I recommend.

For the patient going into summer heat — the marathoner, the yoga practitioner in a hot studio, the traveler landing in humid weather — one bag of Atone brewed daily through the heat weeks, taken in the morning. For the patient who has overheated and whose digestion has not yet returned — two bags brewed twice daily for three to five days. Combine with daily Microgard for the barrier ground the same trial found the formula acted on. Patients often notice the gut recover before the fatigue lifts.

With respect,
Dr. Lan
Your Herbal Pharmacist

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Four formulas for this pattern

Reference
Li L, Ma J, Li Z, et al. Huoxiang Zhengqi dropping pills alleviate exertional heat stroke-induced multiple organ injury through sustaining intestinal homeostasis via regulating MAPK/NF-κB pathway and gut microbiota. Frontiers in Pharmacology. 2025;15:1534713. doi:10.3389/fphar.2024.1534713