If you have ever stood in the supplement aisle trying to pick something for restful sleep, you know how many labels look alike. The good news is that a few parts of the label tell you most of what you need. They are the serving size, the amount of each ingredient, what the numbers mean, and what the claims can and cannot say. Here is a plain guide to reading it, using the Sleep Harmony label as an example.
In this article
From Anirva, the maker of Sleep Harmony. This article is general information, not medical advice. 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.
- Start with the serving size. A serving can be two or more capsules, and every amount on the panel is per serving. [3]
- Look for an amount next to each ingredient. Blends can show only a total weight, not each component's amount. [3]
- Look closely at extracts and "standardized." NIH says the word alone does not show quality. [1]
- Claims come with an asterisk. It leads to an FDA disclaimer that explains what the claim is. [3]
- Sleep Harmony is one formula, not one ingredient. Compare its amounts with the research one ingredient at a time.
Facts at a Glance
| Fact | Detail |
|---|---|
| Serving size | 2 vegetarian capsules |
| Servings per bottle | 30 servings (60 capsules) |
| Ingredients listed | 11 individually listed, plus a 3-species probiotic blend |
| Magnesium % Daily Value | 12% |
| Last reviewed | [DATE] |
What Is on a Supplement Label?
Supplements are regulated differently from medicines. They do not need FDA approval before they are sold. Companies are responsible for having evidence that their products are safe and that label claims are truthful. [1]
That makes the label a good place to start. NIH lists what a label must include: the product name, the net quantity, the name and place of business of the maker, and directions for use. [2] It must also have a Supplement Facts panel showing the serving size, each dietary ingredient, the amount per serving, and the percent Daily Value when one exists. [3] Fillers, binders, colors, sweeteners and flavors go in a separate "Other ingredients" list. On the Sleep Harmony label, that list reads vegetable cellulose capsule, microcrystalline cellulose, stearic acid, silicon dioxide and rice flour.
Start With the Serving Size
According to FDA's labeling guide, one serving is the largest amount the label recommends for one occasion. [3] So if the directions say to take one to three tablets, the serving size is three. Every amount on the panel is per serving. Sleep Harmony's serving is 2 vegetarian capsules, and a bottle holds 30 servings, or 60 capsules. Checking the serving size first keeps a comparison between products fair.
Read the Amounts and Units
Amounts appear in milligrams or micrograms, but what they measure can differ. For minerals, the label lists the element itself. NIH explains that the panel declares the amount of elemental magnesium, not the weight of the whole compound, so "magnesium (as magnesium glycinate) 50 mg" means 50 mg of magnesium. [4] For herbal extracts, FDA's guide says dried extracts are listed by the weight of the extract, and a botanical must name the plant part used. [3] So "valerian root extract 100 mg" means 100 mg of extract from the root, not 100 mg of ground root.
What the Percent Daily Value Tells You
The percent Daily Value shows how much of a day's recommended amount one serving provides, when FDA has set one. [3] Many supplement ingredients, including melatonin and most herbs, do not have a Daily Value. For those, the panel shows a symbol that points to the note "Daily Value not established." On the Sleep Harmony label, magnesium shows 12% of the Daily Value. Melatonin shows none.
What "Standardized" Means
NIH describes standardization as a process makers may use to keep batches consistent, sometimes by measuring specific chemicals called markers. [1] Supplements are not required to be standardized, and there is no legal definition of the word in the United States, so it can mean different things. NIH says the word "standardized" on a label does not necessarily show product quality. [1]
Four herbal lines on the Sleep Harmony label carry a standardization note, such as valerian standardized to 0.8% valerenic acids. That tells you which compound was measured and at what percent. Asking a maker how it tests the extract is a fair next step.
Blends and CFU
A blend groups several ingredients under one name. FDA's guide says the label must show the blend's total weight and list the components in order of weight. It does not have to show each component's amount. [3] Sleep Harmony's label has one blend, the Sleep Harmony Probiotic Blend. Its line shows the total weight, 36 mg, along with 6 billion CFU, and it lists 2 billion CFU for each of three Lactobacillus species.
CFU stands for colony-forming units. NIH says the number of viable cells in a probiotic supplement is shown by the CFU on the label. [5]
Claims and the Asterisk
A front-of-label statement such as "Promotes Restful Sleep*" is what FDA calls a structure/function claim. NIH explains that this kind of claim describes how a product may affect the body, cannot mention a specific disease, and does not need FDA approval. [2] The maker must send FDA the text of the claim within 30 days of putting the product on the market. The asterisk leads to a disclaimer: "This statement has not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease." The Sleep Harmony label includes it.
What a Label Cannot Tell You
A label tells you what a maker says is inside. NIH notes that it is hard to judge quality from a label alone. [1] FDA's manufacturing rules expect makers to guarantee the identity, purity, strength and composition of their products. FDA guidance also says ingredients that are added should be present at the declared amount. [3]
Independent tests have still found gaps. A 2017 study of 31 melatonin supplements found amounts from 83% below to 478% above the label, [9] and a 2023 JAMA study of 25 melatonin gummies found 22 labeled inaccurately. [10] If you would like extra reassurance, you can look for an outside-lab mark such as USP Verified. [7][8] You can also ask the maker for a certificate of analysis, which is a lab report for a batch. NIH's Dietary Supplement Label Database also lets you look up and compare labels. [6]
Comparing Label Amounts With Research
Formulas combine smaller amounts of several ingredients, and studies of single ingredients often used larger amounts, so their results may not apply to a combination. Here is how a few amounts on the Sleep Harmony label compare with the amounts used in studies covered elsewhere on our blog.
| Ingredient | Sleep Harmony Amount | Amounts Used in Studies | Source |
|---|---|---|---|
| Melatonin | 5 mg | Mostly 1 to 5 mg; benefit peaked near 4 mg a day in one analysis | Cruz-Sanabria 2024 [11] |
| Magnesium (as glycinate) | 50 mg | 250 to 729 mg a day in sleep trials | Mah and Pitre 2021 [12]; Schuster 2025 [13] |
| Valerian root extract | 100 mg | 300 to 600 mg a day | NCCIH [14] |
| Ashwagandha root extract | 125 mg | Larger effects at 600 mg a day or more | Cheah 2021 [15] |
| Chamomile flower extract | 50 mg | About 400 mg a day in one older-adult trial | NutraIngredients report [16] |
We did not find studies of these amounts in combination, and the finished formula has not been clinically tested. Every amount is on the label, so you can make this comparison yourself.
Every ingredient, every amount, on one label
Sleep Harmony lists all 11 active ingredients individually, plus the full detail on its probiotic blend — no hidden amounts behind a blend name.
See Sleep HarmonySleep Harmony Is One Formula, Not One Ingredient
Sleep Harmony combines melatonin, calming herbs and three probiotics in one formula, and we chose ingredients that have each been studied for relaxation and sleep.
Because the finished formula has not been clinically tested, we cannot say how the ingredients work together.
A Quick Checklist for Reading a Label
| Check | Why It Matters | What to Look For |
|---|---|---|
| Serving size | Amounts are per serving | Capsules per serving; servings per container |
| Amounts | Each ingredient needs an amount | A weight beside each ingredient, or a blend total |
| Plant part and extract | Root, leaf and flower differ | The plant part, and "extract" in the name |
| Standardization | It hints at consistency | The marker compound and its percent |
| Claims and disclaimer | Claims describe how a product may support the body | An asterisk and the FDA disclaimer |
| Testing | A label cannot show quality | An outside-lab mark or a certificate of analysis |
Good to Know
A simple routine makes label reading quick: the serving size, the amount beside each ingredient, the plant part and standardization, blends, claims, and outside testing. The checklist above works on any product.
The Short Version
A supplement label is easiest to read one part at a time: serving size, amounts, extracts, blends, claims and testing. Each part tells you something, and none tells you everything. Comparing the amounts with the research gives the fullest picture of what a formula contains.
Frequently Asked Questions
What should I look for in a restful sleep supplement?
What does "standardized extract" mean on a supplement label?
What is a proprietary blend?
Do sleep supplements need FDA approval?
What does the asterisk on a supplement label mean?
Does the Sleep Harmony label list the amount of every ingredient?
References
- NIH Office of Dietary Supplements. Background information: dietary supplements (consumer fact sheet). Updated March 11, 2020. https://ods.od.nih.gov/factsheets/DietarySupplements-Consumer/
- NIH Office of Dietary Supplements. Dietary supplements: what you need to know (consumer). https://ods.od.nih.gov/factsheets/WYNTK-Consumer/
- U.S. Food and Drug Administration. Dietary supplement labeling guide: Chapter IV, nutrition labeling. April 2005 (nonbinding guidance). 21 CFR 101.36. https://www.fda.gov/food/dietary-supplements-guidance-documents-regulatory-information/dietary-supplement-labeling-guide-chapter-iv-nutrition-labeling
- NIH Office of Dietary Supplements. Magnesium: fact sheet for health professionals. Updated January 6, 2026. https://ods.od.nih.gov/factsheets/Magnesium-HealthProfessional/
- NIH Office of Dietary Supplements. Probiotics: fact sheet for health professionals. https://ods.od.nih.gov/factsheets/Probiotics-HealthProfessional/
- NIH Office of Dietary Supplements. Dietary Supplement Label Database. https://ods.od.nih.gov/Research/Dietary_Supplement_Label_Database.aspx
- U.S. Pharmacopeia. USP Verified Mark. USP. https://www.usp.org/verification-services/verified-mark
- BSCG. USP certified vitamins: how USP compares to other supplement certifications. July 2026. https://www.bscg.org/blogs/single/usp-certified-vitamins-how-usp-compares-to-other-supplement-certifications
- Erland LAE, Saxena PK. Melatonin natural health products and supplements: presence of serotonin and significant variability of melatonin content. J Clin Sleep Med. 2017;13(2):275–281. PMID 27855744; DOI 10.5664/jcsm.6462. https://jcsm.aasm.org/doi/abs/10.5664/jcsm.6462
- Cohen PA, Avula B, Wang Y-H, Katragunta K, Khan I. Quantity of melatonin and CBD in melatonin gummies sold in the US. JAMA. 2023;329(16):1401–1402. PMID 37097362; DOI 10.1001/jama.2023.2296. https://pubmed.ncbi.nlm.nih.gov/37097362/
- Cruz-Sanabria F, Bruno S, Crippa A, et al. Optimizing the time and dose of melatonin as a sleep-promoting drug: a systematic review of randomized controlled trials and dose-response meta-analysis. J Pineal Res. 2024;76(5):e12985. PMID 38888087; DOI 10.1111/jpi.12985. https://pubmed.ncbi.nlm.nih.gov/38888087/
- Mah J, Pitre T. Oral magnesium supplementation for insomnia in older adults: a systematic review and meta-analysis. BMC Complement Med Ther. 2021;21:125. PMID 33865376; DOI 10.1186/s12906-021-03297-z. https://link.springer.com/article/10.1186/s12906-021-03297-z
- Schuster J, Cycelskij I, Lopresti A, Hahn A. Magnesium bisglycinate supplementation in healthy adults reporting poor sleep: a randomized, placebo-controlled trial. Nat Sci Sleep. 2025;17:2027–2040. PMID 40918053; DOI 10.2147/NSS.S524348. https://www.dovepress.com/magnesium-bisglycinate-supplementation-in-healthy-adults-reporting--peer-reviewed-fulltext-article-NSS
- National Center for Complementary and Integrative Health. Valerian: what you need to know. NIH. https://www.nccih.nih.gov/health/valerian
- Cheah KL, Norhayati MN, Husniati Yaacob L, Abdul Rahman R. Effect of ashwagandha (Withania somnifera) extract on sleep: a systematic review and meta-analysis. PLoS ONE. 2021;16(9):e0257843. PMID 34559859; DOI 10.1371/journal.pone.0257843. https://pubmed.ncbi.nlm.nih.gov/34559859/
- NutraIngredients. Chamomile extract may improve sleep among the elderly: RCT. December 11, 2017 (news report of a 60-person trial). https://www.nutraingredients.com/Article/2017/12/11/Chamomile-extract-may-improve-sleep-among-the-elderly-RCT
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