Research
Who is allowed to touch a supplement batch
The supplement manufacturing rules open with people, not machines. Five short sections cover who must be excluded, who must be qualified, who supervises, and what has to be written down about training.
The rulebook starts with staff
Peptides are frequently sold as dietary supplements, which puts them under a manufacturing rulebook most buyers never open. Its first substantive subpart is about personnel.
That ordering is not accidental. Contamination in a facility usually arrives on a person before it arrives on a surface.
The subpart is five sections long and opens with one sentence: you must establish and follow written procedures for fulfilling the requirements of this subpart.
Everything that follows is therefore supposed to exist as a document as well as a practice.
Excluding a person is a listed obligation
The first requirement is exclusion, and it is written as a duty on the firm rather than a courtesy from the employee.
A firm must take measures to exclude from any operations any person who might be a source of microbial contamination due to a health condition, where such contamination may occur.
The test for who is excluded has three routes. By medical examination, by the person's own acknowledgement, or by supervisory observation.
The conditions named are an illness, an infection, an open lesion, or any other abnormal source of microbial contamination that could contaminate components, supplements, or contact surfaces. The exclusion runs until the health condition no longer exists.
And the employee has a duty to speak up
The exclusion rule has a second half that closes the obvious gap. A firm cannot exclude what it does not know about.
Employees must be instructed to notify their supervisors if they have, or if there is a reasonable possibility that they have, one of those health conditions.
This makes the reporting instruction itself a compliance obligation. A firm that never told its staff to report has failed the second half of the section regardless of what happened.
Nine hygienic practices, spelled out
Anyone working in an operation where adulteration could occur must use hygienic practices to the extent necessary to protect against contamination. The regulation then lists nine.
Outer garments worn so they protect against contamination. Adequate personal cleanliness. Hands washed thoroughly, and sanitized if necessary, in an adequate hand-washing facility both before starting work and any time hands may have become soiled or contaminated.
All unsecured jewelry and other objects that might fall in are removed, and hand jewelry that cannot be adequately sanitized is removed during hand manipulation. Jewelry that cannot be removed must be covered by material kept intact, clean and sanitary.
Gloves used in handling are kept intact, clean and sanitary, and the regulation adds a materials requirement: "The gloves must be of an impermeable material".
Hair restraints where appropriate. No personal belongings stored in exposed areas. No eating, gum, drinking or tobacco in exposed areas.
The catch-all, and what it names
The ninth item is a catch-all, and catch-alls in this rulebook usually carry a list of examples worth reading.
It requires taking any other precautions necessary to protect against contamination of components, supplements or contact surfaces with microorganisms, filth, or any other extraneous materials.
The examples given are specific: perspiration, hair, cosmetics, tobacco, chemicals, and medicines applied to the skin.
That last one is unusual and shows the level the rule is written at. A topical medication on a worker's skin is treated as a potential contaminant of the product.
Qualified is a defined status, not a compliment
The personnel qualification section is short and does three things.
It requires qualified employees who manufacture, package, label or hold dietary supplements.
It requires the firm to identify who is responsible for quality control operations, and adds a separation rule. Each person identified to perform them must be qualified to do so. They must also "have distinct and separate responsibilities related to performing such operations from those responsibilities that the person otherwise has when not performing such operations."
And it sets the qualification standard for everyone: each person engaged in manufacturing, packaging, labeling, holding, or any quality control operations must have the education, training, or experience to perform their assigned functions.
The word is "or", and that matters
The qualification standard reads education, training, or experience. Not all three, and no credential is named.
A regulation written this way is deliberately flexible about how competence is acquired. It is not flexible about whether the firm can show competence exists.
The supervisor section uses the same construction. Qualified personnel must be assigned to supervise manufacturing, packaging, labeling or holding, and each supervisor must be qualified by education, training, or experience to supervise.
So a supervisor is a defined role with a defined basis, and the basis has to be one of those three things.
What has to survive on paper
The records section for this subpart is where the rest becomes checkable, and it names only two categories.
The written procedures for fulfilling the requirements of the subpart. And documentation of training, "including the date of the training, the type of training, and the person(s) trained."
Three fields, and none of them describe content quality. The record shows that training happened, when, of what type, and to whom.
Nothing in the subpart requires a firm to publish any of this, and nothing requires a specific curriculum. It requires that the training be adequate for assigned responsibilities and that the fact of it be recorded.
What a buyer can and cannot do with this
These rules bind manufacturers, packagers, labelers and holders of dietary supplements. A reseller who does none of those things is not the party they govern.
None of the records here reach a buyer. Training logs and written procedures are inspection material.
The value is in knowing what a serious operation is supposed to have. A written personnel procedure, and an exclusion practice with three detection routes. A named quality control function kept separate from other duties, qualified supervisors, and dated training records.
What a supplement facility actually does is not visible from a product page, and this article makes no claim about any specific facility.
Key takeaways
- The supplement manufacturing rules open with a personnel subpart, before plant or equipment.
- A firm must exclude workers who might be a source of microbial contamination, and must instruct staff to report.
- Nine hygienic practices are listed, including a requirement that gloves be of impermeable material.
- Quality control responsibilities must be distinct and separate from the person's other duties.
- Qualification is education, training, or experience — one of the three, with no named credential.
- Training records must carry the date, the type of training, and who was trained.
Frequently asked questions
Do supplement manufacturers have to exclude sick workers?
Yes. The regulation requires measures to exclude from any operations any person who might be a source of microbial contamination due to a health condition. Detection can come by medical examination, the person's own acknowledgement, or supervisory observation, and the exclusion runs until the health condition no longer exists.
What qualifies someone to work on a supplement batch?
Education, training, or experience sufficient to perform their assigned functions. The regulation names no credential and requires only one of the three. It does require the firm to identify who is responsible for quality control operations, and that those responsibilities be distinct and separate from the person's other duties.
What training records are required?
Documentation of training including three fields the regulation names: the date of the training, the type of training, and the persons trained. The subpart also requires that the written procedures for fulfilling its requirements be kept as records.
Does the rule really cover things like jewelry and skin medication?
Yes. Unsecured jewelry that might fall in must be removed, and hand jewelry that cannot be adequately sanitized must be removed during hand manipulation or covered by intact, clean material. The catch-all provision names perspiration, hair, cosmetics, tobacco, chemicals, and medicines applied to the skin as things to protect against.
Can I check whether a seller follows these rules?
Not from a product page. The written procedures and training records these sections require are internal documents made available during inspection, not published. They also bind whoever manufactures, packages, labels or holds the product, which is often not the company whose name is on the front.
Sources
Each document below is named as it names itself, with the date printed on that document rather than the day it was read.
- 21 CFR 111.8, What are the requirements under this subpart B for written procedures? — Electronic Code of Federal Regulations, title 21, August 2026
- 21 CFR 111.10, What requirements apply for preventing microbial contamination from sick or infected personnel and for hygienic practices? — Electronic Code of Federal Regulations, title 21, August 2026
- 21 CFR 111.12, What personnel qualification requirements apply? — Electronic Code of Federal Regulations, title 21, August 2026
- 21 CFR 111.13, What supervisor requirements apply? — Electronic Code of Federal Regulations, title 21, August 2026
- 21 CFR 111.14, Under this subpart B, what records must you make and keep? — Electronic Code of Federal Regulations, title 21, August 2026