What do Korean pharmacists recommend for pharmacy supplements?
Start with what's worn down, not what's trending. Not by chasing whatever ingredient is trending, but by starting with whatever is most run-down right now. Here's the order Korean pharmacies actually work in.
Lay a multivitamin as the base, then stack one thing on top. There's a reason activated B vitamins sell so well in Korea. With probiotics, week four beats a bigger CFU count.