The deteriorated L-proline should not be used, mainly for the following reasons:
Reduced Efficacy: After L-proline deteriorates, its chemical structure may change, leading to the loss or reduction of its physiological activity. For example, in sports nutrition, L-proline, which originally helps to improve exercise endurance and promote muscle recovery, may fail to exert these effects after deterioration and cannot achieve the expected usage results.
Safety Risks: Harmful substances may be generated during the deterioration process, and these substances may pose a hazard to human health. For instance, some toxic or irritating substances may be produced. After use, it may cause adverse reactions such as allergies and poisoning, and may also cause damage to the liver and kidney functions.
Microbial Contamination: The deteriorated L-proline is prone to microbial contamination. The massive reproduction of microorganisms will further damage its quality, and the microorganisms and their metabolites may trigger various health problems, such as intestinal infections and food poisoning.
To ensure safety and effectiveness, the deteriorated L-proline should not be used. It should be properly disposed of and replaced with new, undeteriorated products.