PlainVitamins

Sleep Z-z-zen

by Rainbow Light · capsule · 50 capsules

  • Off the market since March 2023 (NIH)
  • UPC 0 21888 20321 5
  • DSLD label 57187
  • Serving 1 vegetarian capsule
  • 50 servings

Sleep Z-z-zen by Rainbow Light lists 5 ingredients, 3 with an amount per serving of 1 vegetarian capsule, such as 100 mg of L-theanine, 100 mg of GABA and 0.5 mg of melatonin; 2 sit inside a blend without their own amounts. Its current label entered the NIH Dietary Supplement Label Database on March 24, 2016.

What is in Sleep Z-z-zen?

Each row as the label prints it, per serving of 1 vegetarian capsule. 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).

Sleep Z-z-zen: Supplement Facts rows against the market (DSLD label 57187, January 2026 release)
IngredientAmount% DVAmong products listing it
L-Theanine100 mgTheanine in Sleep Z-z-zen 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).

GABA100 mgGABA in Sleep Z-z-zen against 744 products100 mg per serving; the middle half of products list 80 mg to 400 mg, the median 100 mg.100 mg

48% of 744 products listing GABA give more (median 100 mg).

Melatonin0.5 mgMelatonin in Sleep Z-z-zen against 1,557 products0.5 mg per serving; the middle half of products list 2 mg to 5 mg, the median 3 mg.0.5 mg

95% of 1,557 products listing melatonin give more (median 3 mg).

Relaxing Botanical BlendRelaxing Botanical Blend Note: equivalent to 1,100 mg of herbal powder100 mg
California Poppy [aerial parts] extractin the blend, no amount given
Jujube [fruit] extractin the blend, no amount given

Source: NIH ODS Dietary Supplement Label Database, label 57187 (entered March 24, 2016), version 9.4.0. See the label on DSLD. 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:

  • 95% of the 1,557 products that print an amount of melatonin list more than its 0.5 mg of melatonin (median 3 mg).

The NIH database records one serving 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 Sleep Z-z-zen'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
SUGGESTED USAGE: Take 1 capsule, one hour before bedtime. For advanced use, take two capsules.
Warnings
KEEP OUT OF REACH OF CHILDREN.
Consult your health care professional prior to use if you are taking medication, have a medical condition, or are experiencing ongoing sleeplessness. Not formulated for use by pregnant or nursing women.
Do not drive a vehicle or operate machinery for 5 hours after taking this product.
Allergens and what it does not contain
Made with natural, purity-tested ingredients and NO artificial preservatives, colors, flavors or sweeteners.
Contains NO: gluten, wheat, milk, tree nuts, peanuts, soy, eggs, fish, or shellfish.
Gluten-Free

Source: label statements in DSLD label 57187.

What else is on the label?

Other ingredients: Cellulose, Silica, Magnesium Stearate, Non-GMO Capsule.

How many labels does Sleep Z-z-zen have?

One label is on file, entered on March 24, 2016.

  1. Label 57187 (current) Entered March 24, 2016 · off the market March 28, 2023 · 50 capsules · UPC 0 21888 20321 5

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

Who makes it?

The label names Rainbow Light Nutritional Systems (manufacturer, distributor), Santa Cruz, CA. All Rainbow Light products.

Where next?