What cGMP actually asks for
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Set specifications
Decide in writing what the finished product must be and what each incoming ingredient must be. That sounds bureaucratic and it is the foundation: everything else is evidence that you met a specification, and without one there is nothing to have met.
Verify the identity of what comes in
Botanical material is misidentified and substituted upstream often enough that the rule exists specifically for it. A supplier certificate is information, not verification, and the obligation to establish identity sits with the manufacturer.
Write procedures, then follow them
How a batch is made, how equipment is cleaned, how a deviation is handled, who approves what. The point is that the same thing happens whoever is doing it, which is also what makes a product consistent.
Keep batch records, contemporaneously
What went in, which lot, how much, who, when, what came out. Written while it happens, because a record reconstructed afterwards records intentions. This is the document that connects a bottle on a shelf to everything above.
Hold reserve samples
A retained sample from each batch, stored, is how a question about a product sold months ago gets answered. It is a small standing cost and it is the difference between investigating a complaint and speculating about it.
This is where co-packing earns its keep
A contract manufacturer already has the procedures, the testing relationships and the records. For a maker whose strength is formulation and selling rather than documentation, buying that is often cheaper and safer than building it.
It applies to packaging and labeling too
The rule covers manufacturing, packaging, labeling and holding, so the label reconciliation, how many were printed against how many were used, is part of it. Labels on the wrong bottles is a recall, and the control against it is counting them.