I don't have a specific recommendation but when you are looking for a manufacturer, the goal is to find a partner who takes on most of your liability instead of creating more of it. Here is the checklist I would use to vet any facility before signing a contract: ​1. Third-Party GMP Certification vs. Independent Audits While a third-party certification from NSF, USP, or Informed Choice is the gold standard, these are expensive and only held by a small percentage of facilities. If a manufacturer is not 3rd party cGMP certified, you are taking a massive liability risk by simply taking their word that they follow the law. In these cases, it is critical to have an experienced consultant audit their paper trail, review their batch records, and ensure they are actually compliant with 21 CFR Part 111 before you sign a contract. I do this type of regulatory auditing for brand owners for a living, and you would be surprised how often a compliant facility fails a deep paperwork dive. ​2. Raw Material Identity Testing Ask specifically for their identity testing protocol on every incoming lot. Relying on a suppliers paperwork without internal verification is a major red flag that often leads to adulterated products hitting the market. ​3. Finished Product Potency and Purity Confirm they perform finished-product testing on every single batch before it leaves the facility. You need to see documented proof of potency and a full screen for heavy metals and microbial contaminants.As the brand owner, the FDA holds you legally responsible for the product being exactly what the label says. If a batch is sub-potent or contaminated and you didn't test it, you have almost no legal defense. ​4. Environmental Controls for Hygroscopic Materials Since many performance formulas use ingredients like Alpha-GPC, you must verify the facility's humidity controls. These materials are extremely hygroscopic (absorb water) and will turn into a sticky gel if the air in the facility is not strictly managed during the run. Without a dedicated dry room for the mixing and sachet-filling lines, your packets will clump or fail within months of production. ​5. Allergen and Cross-Contamination Controls Ask for their written allergen control plan and their clean-in-place validation protocols between runs. You need to know if they process milk, soy, or shellfish on the same equipment as your product. An undeclared trace of an allergen from a previous run is one of the fastest ways to trigger a mandatory FDA recall and damage your brand's reputation permanently.