PlainVitamins

StressMaster

by Advanced Nutrition by Zahler · capsule · 120 capsules

  • On the market (NIH)
  • UPC 8 48998 08079 2
  • DSLD label 260326
  • Serving 2 capsules; amounts per 4 capsules
  • 30 servings

StressMaster by Advanced Nutrition by Zahler lists 17 ingredients, 17 with an amount per serving of 4 capsules, such as 1,500 mcg of vitamin A, 750 mcg of vitamin C, 134 mg of vitamin E and 1,333 mcg of folate. Its current label entered the NIH Dietary Supplement Label Database on February 23, 2022.

What is in StressMaster?

Each row as the label prints it, per serving of 4 capsules. The capsule beside an amount places it among every product in the NIH database that lists the same ingredient: the bar is the middle half of their amounts, the line in it the median, the whiskers the 10th and 90th percentiles; the green tick is the FDA Daily Value and the red dashed tick the adult upper limit (IOM).

StressMaster: Supplement Facts rows against the market (DSLD label 260326, January 2026 release)
IngredientAmount% DVAmong products listing it
Vitamin Aas Beta-Carotene1,500 mcg167%
Vitamin Cas Ascorbic Acid750 mcg833%

This amount is far outside what other labels list for vitamin C, or disagrees with the label's own %DV: possibly a unit or transcription slip in the database. Check the label image on DSLD.

Vitamin Eas D-Alpha-Tocopheryl Succinate134 mg893%
Folate1,333 mcg333%Folate in StressMaster against 7,022 products1,333 mcg per serving; the middle half of products list 200 mcg to 400 mcg, the median 400 mcg.1,333 mcg

Higher than 98% of 7,022 products listing folate (median 400 mcg). Per day at the most servings: 2,667 mcg.

Folic Acid800 mcg
Valerian root powder450 mgValerian in StressMaster against 647 products450 mg per serving; the middle half of products list 80 mg to 450 mg, the median 200 mg.450 mg

Higher than 74% of 647 products listing valerian (median 200 mg). Per day at the most servings: 900 mg.

Rhodiola root extract400 mgRhodiola in StressMaster against 945 products400 mg per serving; the middle half of products list 50 mg to 250 mg, the median 100 mg.400 mg

Higher than 88% of 945 products listing rhodiola (median 100 mg). Per day at the most servings: 800 mg.

Eleuthero root powder300 mgEleuthero in StressMaster against 726 products300 mg per serving; the middle half of products list 50 mg to 200 mg, the median 100 mg.300 mg

Higher than 84% of 726 products listing eleuthero (median 100 mg). Per day at the most servings: 600 mg.

Gamma Amino Butyric Acid250 mgGABA in StressMaster against 744 products250 mg per serving; the middle half of products list 80 mg to 400 mg, the median 100 mg.250 mg

Higher than 66% of 744 products listing GABA (median 100 mg). Per day at the most servings: 500 mg.

Passionflower, Powderas Passionflower, Passionflower200 mgPassionflower in StressMaster against 562 products200 mg per serving; the middle half of products list 40 mg to 200 mg, the median 100 mg.200 mg

Higher than 70% of 562 products listing passionflower (median 100 mg). Per day at the most servings: 400 mg.

Chinese Skullcap, Powder200 mgBaikal Skullcap in StressMaster against 114 products200 mg per serving; the middle half of products list 40 mg to 200 mg, the median 90 mg.200 mg

Higher than 67% of 114 products listing baikal skullcap (median 90 mg). Per day at the most servings: 400 mg.

Hops flower powder150 mgHops in StressMaster against 342 products150 mg per serving; the middle half of products list 50 mg to 150 mg, the median 75 mg.150 mg

Higher than 74% of 342 products listing hops (median 75 mg). Per day at the most servings: 300 mg.

Sarsaparilla root powder100 mgSarsaparilla in StressMaster against 68 products100 mg per serving; the middle half of products list 60 mg to 862.5 mg, the median 100 mg.100 mg

49% of 68 products listing sarsaparilla give more (median 100 mg). Per day at the most servings: 200 mg.

Licorice root powder100 mgLicorice in StressMaster against 888 products100 mg per serving; the middle half of products list 42 mg to 300 mg, the median 100 mg.100 mg

42% of 888 products listing licorice give more (median 100 mg). Per day at the most servings: 200 mg.

Dandelion root powder100 mgDandelion in StressMaster against 793 products100 mg per serving; the middle half of products list 50 mg to 250 mg, the median 100 mg.100 mg

48% of 793 products listing dandelion give more (median 100 mg). Per day at the most servings: 200 mg.

Wood Betony, Powder100 mg
L-Theanine100 mgTheanine in StressMaster against 1,602 products100 mg per serving; the middle half of products list 90 mg to 200 mg, the median 100 mg.100 mg

47% of 1,602 products listing theanine give more (median 100 mg). Per day at the most servings: 200 mg.

Source: NIH ODS Dietary Supplement Label Database, label 260326 (entered February 23, 2022), version 9.4.0. See the label on DSLD or its label image (PDF). Amounts are what the maker printed; DSLD does not test products. Daily Values: the FDA's Daily Value page.

Is that a lot?

The rows in the top or bottom tenth of the products that list the same ingredient, and any above the adult upper limit at the most servings a day the directions give:

  • Its 1,333 mcg of folate is higher than 98% of the 7,022 folate products that print an amount; 144 list more.

The NIH database records 2 servings a day from the label's directions; its % Daily Values are for adults and children 4 or more years of age. The directions as printed are further down this page.

The Tolerable Upper Intake Level is the most of a nutrient per day, from food, water and supplements together, that is likely to pose no risk for almost all adults (Institute of Medicine, 2011). It does not apply under medical supervision. This page compares labels; it is not medical advice.

Sources: amounts from the DSLD label; Daily Values from 21 CFR 101.9(c)(8)(iv); adult upper limits from the Institute of Medicine's DRI summary tables (2011). How positions are computed.

Which products have the closest formulas?

The products whose ingredient lists overlap most with StressMaster's, rare ingredients counting for more.

Source: ingredient lists of every product's current label in DSLD (version 9.4.0); similarity weights each shared ingredient by how rare it is.

What does the label say about taking it?

Quoted from the label as DSLD transcribed it: the maker's words, including any claim about what the product does, which the FDA has not evaluated and PlainVitamins does not endorse.

Directions
Directions: Take 4 capsules daily, preferably 2 capsules twice a day with food, or as directed by a healthcare practitioner.
Warnings
Keep out of reach of children.
Do not use if safety seal is damaged or missing.
If pregnant, nursing or on medication, consult with your healthcare practitioner.
Allergens and what it does not contain
Non-GMO Dairy free Soy free
Storage
Store tightly closed in a cool, dry place.

Source: label statements in DSLD label 260326.

What else is on the label?

Other ingredients: Hypromellose, Magnesium Stearate.

Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): D (Dairy Kosher) OU (Kosher) This product was manufactured in a GMP certified Facility; Made in the USA.

How many labels does StressMaster have?

One label is on file, entered on February 23, 2022.

  1. Label 260326 (current) Entered February 23, 2022 · on the market · 120 capsules · UPC 8 48998 08079 2

Source: DSLD label entry and market events, version 9.4.0 (labels entered through September 25, 2025).

Who makes it?

The label names Advanced Nutrition by Zahler (distributor), Brooklyn, NY. All Advanced Nutrition by Zahler products.

Where next?