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Hahn J, Cook NR, Alexander EK, et al

Tranexamic acid focuses on reducing hyperpigmentation and brightening the skin, while retinol targets premature skin ageing concerns like fine lines, wrinkles, and uneven skin texture

Needle-Averse or Patients noncompliant with injection Patients who fear needles, travel frequently, or have difficulty making regular appointments for injections may prefer a self-administered oral option that maintains therapeutic efficacy

Without human PK/PD, there is no established relationship between an administered amount and a plasma concentration, no half-life, no tissue-distribution data, and therefore no rational basis for any human dosing

I believe both nutrients are vital for protection against severe disease