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Although other delivery methods are possible, such as oral delivery (for example, ALA, which is more convenient for patients but is associated with concerns over inter-patient variability in bioavailability and pharmacokinetics, photosensitizing agents are typically administered in clinical settings through intravenous or topical application

"A performance evaluation of three drug-induced liver injury biomarkers in the rat: alpha-glutathione S -transferase, arginase 1, and 4-hydroxyphenyl-pyruvate dioxygenase" (PDF)

What patients typically describe is a gradual sharpening over the first 2 to 4 weeks: less brain fog, easier recall, faster processing of new information, and a sense that complex tasks feel more manageable

2024, doi:10.1007/s00424-024-02910-7 Wu, Jing et al