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Proof of concept
Use a wellness survey which is about 50 T/F questions administred before and after using the nutritional suppliment. Comapre the results to a placebo control group. If you administer it at intervals of 3-6 months and show a gradual change it will be more convincing data.
You should definitely compare placebo with your product. Depending on how quick the effect is, and how long it lasts, I would suggest to have all people have both the placebo and the personalized nutrition. This will prove the concept the best way. Especially because you can not control other external factors.
A company will not "prove" that a "personalized" nutrition product will make a therapeutic difference in their consumers' life.
At best, it can be shown, based on results of well-designed clinical studies, that in a given population there may be a probability of such effect in some individuals.
Assuming that a personalized product is specifically designed for each individual, proving that it has an effect will need to be determined for each individual.
Clinicial trials and factual evidence, in my 20 years of experience on nutritionals, are excellent ways to prove a personalized nutrition product will make a therapeutic difference to consumers on a consistent, long-term basis. But that is often an elusive and expensive goal.
Much can also be accomplished with the correct tone and attitude of the advertising, marketing and packaging. Expert sciendtific and medical endorsements can also make a difference. Even celebrity endorsements with the creative properly curated can prove powerfully persuasive as well. But consistency is essential to any message. I helped make the Centrum vitamin franchise #1 worldwide thoughout the 80's, 90's and into the 2000's by single mindedly reinforcing the concept of the "most compete" line of multivitamins.
Creative Director / Life Coach
Panelist responses to questions pertaining to their well-being is one type of measure in a clinical evaluation. There are many other objective measures that should be considered as well. For instance, evaluation of various body chemistries ranging from blood measures to genetic measures to changes in gut bacterial composition.
The question asks about PROVING THAT PERSONALIZED NUTRITION DELIVERS A THERAPEUTIC DIFFERENCE TO THE CONDUMER. Mr. Leung's answer refering to what can be accomplished "with the correct tone and attitude of the advertising, marketing and packaging" is completely of the mark. Where is any proof in that? "Celebrity endorsements with the creative properly curated can prove powerfully persuasive as wel" - but whete is the PROOF?
I agree that scientific and medical endorsement would help, but has the writer considered what studies would need to be done to prove that PERSONALIZED NUTRITION, i. e., nutrition specifically designed for a given individual consumer, would have beneficial therapeutic effect? I very much doubt it.