StressMaster

StressMaster

Advanced Nutrition by Zahler4.6 (2,893 ratings)
Format:Capsule Quantity: 120 Capsule(s) · 30 servings
Goals
$36.38 $1.21 per serving

Product analysis

47 out of 100

StressMaster combines herbs, GABA and theanine that may help with stress-related fatigue and short-term tension. Some calming herbs can reduce daytime alertness, which matters before tasks requiring concentration.

AI assessment of the formula, label and price. How scoring works

Nutrient Quality25

Many herbal preparations are not described clearly enough to compare their quality. Folate, eleuthero and theanine also lack the form details needed for a clearer conclusion.

Ingredient Transparency72

Amounts are listed, so you can check the quantity of each declared ingredient. Most forms and preparations remain unspecified, making comparisons with well-described alternatives harder.

Value For Money30

The serving cost gives weak value for valerian, eleuthero and theanine, with more modest value for GABA. Value for the remaining ingredients is less clear.

Customer Satisfaction84

Customer feedback is positive across a large number of reviews. The review volume gives a broader picture of satisfaction than a small sample would.

Product Focus42

The formula is mainly aimed at stress, with less consistent support for sleep, energy and focus. Combining calming and activating herbs can make its usefulness depend on the time of day and intended task.

Format
Capsule
Container
120 Capsule(s)
Per serving
$1.21
Customer rating
4.6 · 2,893 ratings
Report analysis

Goals

Impact
Lower effect
F Ingredient FitF PathwaysB+ EvidenceA Formulation Logic
Theanine · 100 mg
Study evidence
GABA Supportive 4 studies
Theanine Supportive 8 studies
Valerian Supportive 31 studies
Stress Relief
Impact
High effect
C Ingredient FitA+ PathwaysA EvidenceA+ Formulation Logic
Folate · 1333.33 mcgGABA · 250 mgVitamin C · 750 mcgEleuthero · 300 mgTheanine · 100 mg
Study evidence
Folate Supportive 19 studies
GABA Supportive 6 studies
Rhodiola Supportive 16 studies
Theanine Supportive 16 studies
Valerian Supportive 18 studies
Vitamin C Supportive 11 studies
Mood Support
Impact
Moderate effect
D+ Ingredient FitD PathwaysA- EvidenceA+ Formulation Logic
Folate · 1333.33 mcg
Study evidence
Folate Supportive 84 studies
GABA Supportive 12 studies
Theanine Supportive 12 studies
Valerian Supportive 17 studies
Productivity Boost
Impact
Lower effect
D- Ingredient FitF PathwaysC EvidenceA Formulation Logic
Eleuthero · 300 mgEleuthero · 300 mgTheanine · 100 mg
Study evidence
Eleuthero Not classified

No linked studies yet.

Rhodiola Supportive 7 studies
Theanine Supportive 5 studies
Cognitive Support
Impact
Moderate effect
D Ingredient FitF PathwaysB- EvidenceA+ Formulation Logic
Folate · 1333.33 mcgTheanine · 100 mg
Study evidence
Folate Supportive 68 studies
Rhodiola Supportive 7 studies
Theanine Supportive 25 studies
Energy
Impact
Moderate effect
D Ingredient FitD- PathwaysD- EvidenceA Formulation Logic
Study evidence
Eleuthero Disputed 3 studies
Rhodiola Supportive 18 studies
Theanine Not classified

No linked studies yet.

Ingredients

IngredientAmount per servingScore
Vitamin A (Beta-Carotene)
1500 mcg
Vitamin C (Ascorbic Acid)
750 mcg
Vitamin E (D-Alpha-Tocopheryl Succinate)
134 mg
Folate
1333.33 mcg 37
Valerian root powder
450 mg
Rhodiola root extract
400 mg
Eleuthero root powder
300 mg
Gamma Amino Butyric Acid
250 mg 73
Passionflower, Powder
200 mg
Chinese Skullcap, Powder
200 mg
Hops flower powder
150 mg
Sarsaparilla root powder
100 mg
Licorice root powder
100 mg
Dandelion root powder
100 mg
Wood Betony, Powder
100 mg
L-Theanine
100 mg 76
Adults 18–50 Kosher Dairy Free Vegetarian
Report overview
Theanine · 100 mg OverallScore76
B+ Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyF Value
GABA · 250 mg OverallScore73
B- Active Ingredient Quality & BioavailabilityA Dose, Safety & Label TransparencyD- Value
Report alternatives

Sources

Published studies used for the product analysis and the top-ranked studies for each ingredient and goal.

  1. B vitamins and prevention of cognitive decline and incident dementia: a systematic review and meta-analysis.
    Wang Z; Zhu W; Xing Y; Jia J; Tang Y · Nutrition reviews · 2022
    Meta-analysis46,175 participants95 studies pooledBrain Health Cognitive Support forFolate
  2. Folate and long-chain polyunsaturated fatty acid supplementation during pregnancy has long-term effects on the attention system of 8.5-y-old offspring: a randomized controlled trial.
    Catena A; Muñoz-Machicao JA; Torres-Espínola FJ; Martínez-Zaldívar C; Diaz-Piedra C; Gil A; Haile G; Györei E; Molloy AM; Decsi T; Koletzko B; Campoy C · The American journal of clinical nutrition · 2016
    Randomized trial136 participantsBrain Health Mental Focus forFolate
  3. Folic acid supplementation improves cognitive function in participants with cerebral small vascular disease-related cognitive impairment: a randomized controlled trial.
    Liu Y; Yu Z; Cai Z; Zhao L; Wang Y; Guo Y; Su X; Miao Y; Yi B; Wang Y; Zhang X · The journal of prevention of Alzheimer's disease · 2025
    Randomized trial220 participantsBrain Health forFolate
  4. Circulating folate concentrations and the risk of mild cognitive impairment: A prospective study on the older Chinese population without folic acid fortification.
    Fu J; Liu Q; Zhu Y; Sun C; Duan H; Huang L; Zhou D; Wang Z; Zhao J; Li Z; Ma F; Li W; Liu H; Zhang X; Chen Y; Wang G; Du Y; Huang G · European journal of neurology · 2022
    Cohort study3,974 participantsBrain Health forFolate
  5. Normal-But-Low Serum Folate Levels and the Risks for Cognitive Impairment.
    Jang S; Han JW; Shin J; Kim TH; Kwak KP; Kim K; Kim BJ; Kim SG; Kim JL; Kim TH; Moon SW; Park JY; Park JH; Byun S; Suh SW; Seo J; So Y; Ryu SH; Youn JC; Lee KH; Lee DY; Lee DW; Lee SB; Lee JJ; Lee JR; Jeong H; Jeong HG; Jhoo JH; Han K; Hong JW; Kim KW · Psychiatry investigation · 2020
    Cohort study3,910 participantsBrain Health forFolate
  6. Dose-Response Effects of Short-Term Rhodiola rosea (Golden Root Extract) Supplementation on Anaerobic Exercise Performance and Cognitive Function in Resistance-Trained Athletes: A Randomized, Crossover, Double-Blind, and Placebo-Controlled Study.
    Koozehchian MS; Newton AT; Mabrey G; Bonness FM; Rafajlovska R; Naderi A · Nutrients · 2025
    Randomized trial27 participantsBrain Health Mental Focus forRhodiola
  7. A combination of green tea, rhodiola, magnesium and B vitamins modulates brain activity and protects against the effects of induced social stress in healthy volunteers.
    Boyle NB; Billington J; Lawton C; Quadt F; Dye L · Nutritional neuroscience · 2022
    Randomized trial100 participantsBrain Health forRhodiola
  8. Rosenroot (Rhodiola rosea): traditional use, chemical composition, pharmacology and clinical efficacy.
    Panossian A; Wikman G; Sarris J · Phytomedicine : international journal of phytotherapy and phytopharmacology · 2010
    Narrative reviewBrain Health forRhodiola
  9. Rhodiola rosea in stress induced fatigue--a double blind cross-over study of a standardized extract SHR-5 with a repeated low-dose regimen on the mental performance of healthy physicians during night duty.
    Darbinyan V; Kteyan A; Panossian A; Gabrielian E; Wikman G; Wagner H · Phytomedicine : international journal of phytotherapy and phytopharmacology · 2001
    Randomized trial56 participantsBrain Health Everyday Health Productivity Boost forRhodiola
  10. Effects of a Rhodiola rosea extract on mental resource allocation and attention: An event-related potential dual task study.
    Koop T; Dienel A; Heldmann M; Münte TF · Phytotherapy research : PTR · 2021
    Single-arm trial50 participantsBrain Health Cognitive Support forRhodiola
  11. Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial.
    Hidese S; Ogawa S; Ota M; Ishida I; Yasukawa Z; Ozeki M; Kunugi H · Nutrients · 2020
    Randomized trial30 participantsBrain Health Cognitive Support Sleep Support forTheanine
  12. A Randomized, Triple-Blind, Placebo-Controlled, Crossover Study to Investigate the Efficacy of a Single Dose of AlphaWave® L-Theanine on Stress in a Healthy Adult Population.
    Evans M; McDonald AC; Xiong L; Crowley DC; Guthrie N · Neurology and therapy · 2021
    Randomized trialBrain Health Stress Relief forTheanine
  13. Effects of Tea (Camellia sinensis) or its Bioactive Compounds l-Theanine or l-Theanine plus Caffeine on Cognition, Sleep, and Mood in Healthy Participants: A Systematic Review and Meta-Analysis of Randomized Controlled Trials.
    Payne ER; Aceves-Martins M; Dubost J; Greyling A; de Roos B · Nutrition reviews · 2025
    Meta-analysis50 studies pooledBrain Health Cognitive Support Mental Focus forTheanine
  14. Assessing the effects of caffeine and theanine on the maintenance of vigilance during a sustained attention task.
    Foxe JJ; Morie KP; Laud PJ; Rowson MJ; de Bruin EA; Kelly SP · Neuropharmacology · 2012
    Randomized trial27 participantsBrain Health Cognitive Support forTheanine
  15. Effects of l-Theanine on Cognitive Function in Middle-Aged and Older Subjects: A Randomized Placebo-Controlled Study.
    Baba Y; Inagaki S; Nakagawa S; Kaneko T; Kobayashi M; Takihara T · Journal of medicinal food · 2021
    Randomized trialBrain Health Mental Focus Productivity Boost forTheanine
  16. No benefit adding eleutherococcus senticosus to stress management training in stress-related fatigue/weakness, impaired work or concentration, a randomized controlled study.
    Schaffler K; Wolf OT; Burkart M · Pharmacopsychiatry · 2014
    Randomized trial144 participantsCognitive Support Mental Focus Stress Relief forEleuthero
  17. Effects of 6-Month Folic Acid Supplementation on Cognitive Function and Blood Biomarkers in Mild Cognitive Impairment: A Randomized Controlled Trial in China.
    Ma F; Wu T; Zhao J; Han F; Marseglia A; Liu H; Huang G · The journals of gerontology. Series A, Biological sciences and medical sciences · 2017
    Randomized trial180 participantsCognitive Support forFolate
  18. Serum folate and B12 levels in association with cognitive impairment among seniors: results from the VELESTINO study in Greece and meta-analysis.
    Michelakos T; Kousoulis AA; Katsiardanis K; Dessypris N; Anastasiou A; Katsiardani KP; Kanavidis P; Stefanadis C; Papadopoulos FC; Petridou ET · Journal of aging and health · 2013
    Meta-analysis8,122 participants9 studies pooledCognitive Support forFolate
  19. Homocysteine and folate as risk factors for dementia and Alzheimer disease.
    Ravaglia G; Forti P; Maioli F; Martelli M; Servadei L; Brunetti N; Porcellini E; Licastro F · The American journal of clinical nutrition · 2005
    Cohort study816 participantsCognitive Support forFolate
  20. Folate mediates cognitive impairment of aged people with periodontitis.
    Liu F; Liu Y; Feng Y; Zhao J; Wang M; Ye M; Zhang Y; Gan X; Pan Q; Shen J · Nutritional neuroscience · 2025
    Cross-sectional study1,966 participantsCognitive Support forFolate