Final answer:
The effectiveness of NAD supplementation from health food stores like Inada would depend on the girl's specific health condition, which is not described in the question; it should only be considered under medical guidance.
Step-by-step explanation:
The question pertains to the supplementation of NAD (Nicotinamide Adenine Dinucleotide) in a girl whose specific condition is not mentioned. NAD is a coenzyme found in all living cells and is essential for energy production and metabolic processes. Products like Inada that are sold in health food stores typically claim to provide various health benefits. However, whether administering NAD can save the girl would depend on her specific health condition, which is not provided in the question. If she has a condition related to NAD deficiency, such as certain metabolic disorders, supplementation may be beneficial under medical guidance. It is critical to consult healthcare professionals before starting any new supplement regimen, especially to address health concerns.