How Do LactMed Entries on Herbs and Supplements Differ from Drug Entries?
The NIH Drugs and Lactation Database (LactMed) includes records for botanical products and dietary supplements as well as for prescription and over-the-counter medications. Those herbal records follow the same section layout as drug records, but they are usually shorter, lean on fewer published studies, and often state plainly that little or no relevant data were located. Understanding that difference is largely a matter of understanding why the underlying literature is thinner.
This page describes how such entries are constructed and what their recurring language means. It does not evaluate any particular herb or supplement, and nothing here should be read as a judgment about using one.
Why the evidence base is different
A prescription drug typically arrives in the literature with pharmacokinetic studies, a known dose, a known chemical identity, and in many cases published measurements of concentrations in milk. A botanical product arrives with none of that guaranteed. Preparations differ in which part of the plant is used, how it was extracted, how concentrated the result is, and what else is in the capsule. Dietary supplements in the United States are also regulated differently from drugs, which means composition and labeling consistency cannot be assumed across products carrying the same common name.
The consequence inside LactMed is visible in the text. Where a drug record may report measured levels in milk from several studies, an herbal record may report that no published measurements were found, or may describe a single small study, or may note that the product's active constituents are not clearly identified. Searches that pair the database name with a specific botanical — valerian, rhodiola, and similar — are generally met with an entry that is candid about the limits of what has been studied.
The sections, and how they read in an herbal entry
The headings themselves are familiar to anyone who has worked through how to read a LactMed record. What changes is how much each one contains.
- The summary section in an herbal record often leads with a statement about the scarcity of data rather than with a finding.
- Drug levels sections may be brief or state that measurements in milk and in nursing infants have not been reported.
- The effects on lactation and breastmilk section is where traditional or folk use as a galactogogue is sometimes noted, usually alongside a note about whether controlled evidence supports the claim.
- The reference list is the best gauge of how much is actually known; a short list of case reports and reviews signals a different evidentiary situation than a long list of clinical studies.
Read that way, an herbal entry is informative even when it concludes very little. "No published data were found" is a real finding about the state of the literature, and it is more honest than the confident claims that circulate elsewhere about the same products.
Where interpretation belongs
LactMed assembles and summarizes evidence; it does not tell an individual what to take. Translating a sparse record into a decision for a specific person is clinical work, and it is the point at which a prescriber, pharmacist, or lactation clinician becomes necessary rather than optional. Clinicians also work from structured protocol literature — the Academy of Breastfeeding Medicine's clinical protocols are an example of the sort of synthesized guidance used in practice — and from the patient's full history, which no database contains.
Parent-facing federal and professional resources cover the surrounding questions in plainer language. The Office on Women's Health breastfeeding pages and the American Academy of Pediatrics' HealthyChildren breastfeeding section address common nursing problems and what to raise with a clinician, which is usually what someone searching an herb name is really trying to resolve.
Why training programs point at these entries
Maternal-infant caregiver coursework uses herbal LactMed records as a teaching example precisely because they model restraint: a federal, peer-reviewed reference declining to overstate what is known. For students on the maternal-infant side of caregiver education, covered in where breastfeeding education fits in caregiver training, the transferable skill is recognizing the difference between an absence of evidence and an evidence of absence — and knowing that neither is theirs to act on.