Single‑Dose Study
Lower mental-stress and tension–anxiety scores vs. placebo*
Measured within 60 minutes of a single dose
Read study →The Science Behind Arctic Composure
Composure when you need it. Resilience when you build it.
Stress isn’t only a momentary problem. Arctic Composure was designed around two goals: support calm, focused attention when pressure is high—and support a more resilient response to everyday stress with consistent use over time.
We started with clinically studied L‑theanine, already widely used in the U.S. for calm, focused attention. Then we searched globally for ingredients with something harder to find: meaningful human clinical evidence for both short‑term composure and longer‑term stress resilience.
That led us to L. gasseri CP2305, a Japanese postbiotic studied for acute and sustained stress response, and a probiotic combination of L. helveticus R0052 and B. longum R0175, studied in humans during periods of ongoing everyday stress.
50+
Published human studies across four core ingredients
L‑Theanine
31 randomized trials
1,168 participants
L. gasseri CP2305
8+ randomized human trials
Acute + sustained‑use research
L. helveticus R0052 + B. longum R0175
9 human clinical studies
5+ randomized trials
Studies cited on this page evaluated the individual ingredients or specific strains—not the finished Arctic Composure formula. Individual results may vary.
A probiotic—for stress resilience?
Yes. Your brain really does listen to your gut.
Your gut and brain communicate constantly—which is why stress can produce butterflies or an upset stomach. That communication works in both directions.
Your microbiome helps generate signals that reach the brain through the nervous system, immune system, hormones, and microbial compounds. These pathways can influence mood and how you respond to stress.*
The specific probiotic strains L. helveticus R0052 and B. longum R0175, and the postbiotic L. gasseri CP2305, have produced measurable improvements in human studies—including measures of everyday stress, emotional balance, relaxation-related brain activity, and resilience during sustained pressure.*
Two time horizons. Four clinically studied ingredients.
In acute human studies, within 60 minutes L‑theanine improved attention and focus and lowered salivary cortisol, while L. gasseri CP2305 increased alpha‑wave activity and parasympathetic activity and lowered mental‑stress and tension–anxiety scores.*
With consistent daily use, the R0052 and R0175 probiotic strains reduced cortisol levels and improved psychological‑distress measures. In medical students subjected to sustained high pressure over time, CP2305 reduced anxiety and sleep disturbance.*
Studies cited on this page evaluated the individual ingredients or specific strains—not the finished Arctic Composure formula. Individual results may vary.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
L‑Theanine
A familiar starting point.
31 Randomized Trials · 1,168 ParticipantsL‑theanine is widely used for calm, focused attention without sedation. A recent systematic review and meta‑analysis examined 31 randomized trials involving 1,168 participants across stress, attention and cognitive outcomes.
In acute testing, a single 200 mg dose taken 30–60 minutes before testing significantly improved choice reaction time.*
In a separate randomized, placebo‑controlled crossover study, a single 200 mg dose significantly lowered salivary cortisol within 60 minutes compared with placebo.*
View the research (3 studies)
- Cognitive and affective effects of L‑Theanine: a systematic review and meta-analysis of 31 randomized trials →
- Effects of L‑Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults →
- Randomized, placebo-controlled crossover study of a single 200 mg L‑Theanine dose on stress and salivary cortisol →
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
L. gasseri CP2305
A different approach to composure—from Japan.
8+ Randomized Human TrialsCP2305 is a heat‑treated postbiotic that produced measurable changes in brain activity, autonomic activity, and self‑reported stress levels in a randomized human trial.*
Human clinical studies of L. gasseri CP2305 have examined its effects on brain activity, parasympathetic activity and mental‑stress measures after a single dose, and on stress response after daily use for up to 24 weeks.*
24‑Week Study
Lower anxiety scores and improved sleep quality*
Medical students under prolonged examination stress
Read study →*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
L. helveticus R0052 + B. longum R0175
Because composure isn’t only about the next hour.
5+ Randomized Human TrialsThis probiotic combination pairs Lactobacillus helveticus R0052 and Bifidobacterium longum R0175—the same two strains used together in randomized human trials that reported improvements in psychological‑distress and stress‑related measures.
In a randomized, placebo‑controlled study, 30 days of these strains significantly improved several psychological‑distress measures and reduced cortisol compared with placebo.*
Why it matters: these strains add the longer‑term dimension to Arctic Composure, with human research examining consistent use during periods of everyday stress.
30 Days
Significantly improved psychological‑distress measures and reduced cortisol versus placebo.*
View the research (2 studies)
- Assessment of psychotropic-like properties of a probiotic formulation (Lactobacillus helveticus R0052 and Bifidobacterium longum R0175) in rats and human subjects →
- Probiotic food supplement reduces stress-induced gastrointestinal symptoms in volunteers: a double-blind, placebo-controlled, randomized trial →
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Beyond ordinary stress support.
L‑theanine gives Arctic Composure a clinically studied, familiar foundation. L. gasseri CP2305 adds an unusual Japanese postbiotic with human research spanning acute and longer‑term stress. the L. helveticus R0052 and B. longum R0175 probiotic strains add clinical research for the consistent‑use side of the formula.
Different ingredients. Different research. One purpose: support greater composure today while building resilience over time.
Today
L‑theanine + L. gasseri CP2305
Calm · Focus · Composure
Consistent Use
L. gasseri CP2305 + R0052 + R0175
Everyday stress resilience
What’s actually inside.
Research-aligned amounts of our four core ingredients.
Research is only useful if it helps in real life.
Arctic Composure brings together clinically studied ingredients to support calm today and resilience over time.*
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Manufactured in the USA • Made in a GMP‑certified facility • Independently tested