The importance of preserving physical evidence cannot be overstated, as actual product containers, even if empty, can provide crucial information about ingredients, manufacturers, and formulations that may not be available through other sources, particularly for older products that have since been reformulated or discontinued. Women currently using relaxers should photograph products including all labeling and ingredient lists, save containers even after finishing them, and document any adverse reactions like scalp burns or irritation that could support claims about product dangerousness beyond cancer risks, creating a contemporaneous record that carries more weight than later recollections. Social proof through affidavits from hairstylists who recommended or applied specific products, friends who shared hair care experiences, or family members who purchased relaxers as gifts can corroborate personal testimony and strengthen credibility when memory of specific brands or timelines becomes challenged during litigation, because multiple independent sources create a more compelling narrative than individual recollection alone.