I'm worried about my skin becoming more and more dull these days. What kind of health functional food should I choose?

As I was applying makeup as usual, I suddenly felt unfamiliar with my reflection in the mirror. Seeing my skin lose its vitality and become dull, I realized I really needed to take better care of it. So, I slowly started researching health functional foods, which many people recommended. Everyone around me unanimously agreed that replenishing the body's nutrients is paramount as we age. I'm now more interested in and concerned about health functional foods that strengthen the body from the inside out, rather than focusing on outward glamour. Especially these days, when fatigue persists, I feel even more compelled to take care of my body. Expensive cosmetics are great, but for fundamental change, I think developing a habit of nurturing the inner self comes first. Of the numerous health functional foods on the market, which ones have you found most satisfying when taking consistently? If you've tried any and found them to be truly beneficial for improving your complexion or boosting your vitality, could you please share your recommendations?