The Berry the Soviets Investigated for Endurance: Schisandra and the Science of Mental Performance

During World War II, Soviet scientists began investigating an unusual question: Could a traditional medicinal plant help people maintain physical and mental performance under extreme conditions?

At the time, military forces were heavily exploring synthetic stimulants to help pilots remain alert and endure prolonged periods of physical and mental exertion. The Soviet Union was interested in finding plant-derived alternatives that could support alertness, endurance, and working capacity while (we imagine) having minimal to no side effects of synthetics.

Their search led them to a berry with a history stretching back thousands of years.

Its name was Schisandra.

An Ancient Berry with Five Flavors

Known in Traditional Chinese Medicine as Wu Wei Zi, meaning “five-flavor fruit,” Schisandra (Schisandra chinensis) has been used in Chinese herbal medicine for centuries.

Its name comes from its distinctive combination of sweet, sour, bitter, pungent, and salty flavors.

The Shennong Bencao Jing, one of the foundational texts of Chinese materia medica, describes the berry in terms of its traditional therapeutic properties:

“Wu Wei Zi is sour in flavor and warm in nature. It replenishes Qi, addresses coughing with rebellious upward Qi, emaciation and debility from overexertion, and deficiency.”

The passage is particularly interesting for its reference to debility from overexertion. Traditional practitioners incorporated Schisandra into herbal formulations for exhaustion, persistent cough, excessive sweating, and other patterns of imbalance.

Its reputation extended beyond China. Among Nanai hunters of Siberia and northern Manchuria, Schisandra berries were traditionally valued during long, physically demanding journeys, where they were consumed to help combat thirst, hunger, and exhaustion.

By the time Soviet researchers began investigating the plant, Schisandra already had a remarkable reputation for supporting endurance.

What Did the Soviet Research Discover?

Soviet investigations continued for decades, producing an extensive body of pharmacological and human research.

By the early 1960s, Schisandra had gained recognition in official Soviet medicine following numerous studies conducted during the preceding two decades.

Its reputation was eventually reflected in Russian medical textbooks.

In Medicinal Drugs, Russian physician M. D. Mashkovsky described Schisandra as a stimulant of the central nervous system, noting:

“In the event of mental exhaustion it increases the capacity of work.”

Another Russian medical textbook, Pharmacognosy, described its effects in particularly interesting terms:

“Working capacity increases ‘softly’ without subjectively felt excitement.”

The same text described increases in muscular force and vital lung capacity, alongside greater resistance to unfavorable environmental conditions.

Researchers had begun investigating these effects through experiments involving soldiers, athletes, sailors, and people performing demanding cognitive tasks.

The Physical Performance Findings

1. Increased physical working capacity

Early human experiments reported increases of approximately 24–42% in measured physical working capacityfollowing administration of Schisandra preparations. Researchers also reported increases in muscular force.

2. Reduced physical exhaustion

In a historical study involving Red Army soldiers completing a 20-kilometer ski run, those receiving Schisandra preparations reported less exhaustion, breathlessness, thirst, and muscular pain than the placebo group.

The findings suggested that Schisandra could influence how people experienced strenuous physical exertion.

The Mental Performance Findings

Perhaps even more interesting was the research into Schisandra's effects on cognitive performance.

One experiment involved 43 young telegraph operators, aged 21–24, tasked with transmitting Morse code at maximum speed for five consecutive minutes.

Researchers measured how frequently the operators made errors after receiving Schisandra extract, its isolated compound schizandrin, or a placebo.

The placebo group's error frequency climbed to 130% of its baseline level.

Among participants receiving Schisandra preparations, error frequency remained between 84% and 103% of baseline.

In other words, the Schisandra groups experienced substantially less deterioration in accuracy during demanding mental work.

Other historical studies reported improvements in attention, visual memory, sensorimotor response times, and coordination.

Researchers were particularly interested in the possibility that Schisandra could help preserve mental performance during prolonged work and fatigue.

The Science Behind the Berry

Schisandra contains a distinctive group of plant compounds known as lignans, including schisandrin.

Modern pharmacological research has investigated these compounds for their antioxidant, hepatoprotective, and stress-related activities. Laboratory and animal studies have explored their influence on oxidative stress, cellular protection, and physiological responses to demanding conditions.

Although many of the historical human findings require modern replication, the breadth of research is remarkable.

An ancient medicinal berry had become the subject of decades of scientific investigation into physical endurance, fatigue, attention, and mental performance.

How to Take Schisandra: Our Experience

Our first experiment with schisandra was as a decoction, and we'll admit: it was strong. To be fair, we may have taken a bit more than the "average," since we are accustomed to taking herbal preparations. Let it be known: there is always a plant waiting to humble you!

Now, nothing bad happened. We simply experienced a more intense detox reaction through some breakouts (again, nothing absurd, just a bit more than usual). Schisandra does support the liver and detox channels, so it made sense that our skin would reflect the stimulation of these organs. 

All this to say: Schisandra is a powerful little berry, but as you just read, when used correctly, it can have profound benefits. We still drink the decoction regularly (just not in huge gulps), although we would recommend starting out with a water AND alcohol extract (dual-extraction), just so that you get the full benefits of all the compounds in schisandra. 

Here you can see it in action in our Wild Reishi Tincture, which features schisandra alongside a Traditional Chinese Medicine inspired formula for purification, reducing stress, and promoting a radiant complexion:

All you need is 1-2 droppers full. It tastes like a Shirley Temple, so you can take it straight. Alternatively, it infuses well into fruity drinks, teas, and smoothies. Also, if you sign up for the newsletter, you can receive 10% OFF if you want to give it a try!

Let us know in the comments how schisandra has helped with either your energy levels or mental performance.

• Panossian, A. & Wikman, G. (2008). Pharmacology of Schisandra chinensis Bail.: An Overview of Russian Research and Uses in Medicine. Journal of Ethnopharmacology, 118, 183–212. Read the scholarly review.

• Shennong Bencao Jing (神农本草经), entry for 五味子 (Wu Wei Zi). Classical Chinese source; the English passage above is a translation, not a verbatim English quotation from the ancient text.

  
  

• Mashkovsky, M. D., Medicinal Drugs (1978, 2000), and Muravjeva, D. A., Pharmacognosy (1978, 1991). Quotations reproduced in the Panossian and Wikman review

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