How to choose a good NMN supplier?

When choosing a supplier for NMN (nicotinamide mononucleotide), it is important to consider several factors to ensure the quality and efficacy of the product:

1. Reputation and Establishment: Opt for a supplier that is well-established in the market.
2. Quality Control: Ensure the company follows Good Manufacturing Practices (GMP). This designation indicates a certain level of quality control, reducing the risk of contaminants like iron filings in the product.
3. Product Appearance and Taste: High-quality NMN should be white and crystalline. As a personal check, some users taste the NMN to confirm its quality, expecting a taste similar to burnt popcorn, though this is more anecdotal (1).

These guidelines help ensure that the NMN purchased is likely pure and effective. However, it's also noted that individual responses to NMN can vary based on factors like age, sex, and microbiome, so personal measurement and monitoring are recommended.