Not every category here carries the same weight of established research. Unbox Health tests what is inside every product for label accuracy, safety and nutrition, not its efficacy. Calcium, Vitamin D and Vitamin B12 have well-established roles in ageing bone and nerve health. Omega-3 and Protein Powders, relevant to protein supplements for elderly diets, are backed by extensive nutrition research. Vitamin K2 and CoQ10 have limited, growing evidence. Multivitamins vary by formulation.