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It's just in the hours following resistance training, specifically for hypertrophy and strength training

Vitamin B12 is water-soluble, and the body excretes excess amounts

PubMed Draper, H.H

Integrin function: molecular hierarchies of cytoskeletal and signaling molecules

The compound remains detectable in urine for up to 4 days by mass spectrometry methods, despite its short plasma half-life, suggesting tissue distribution and binding may extend its biological effects beyond plasma clearance times

Moreover, spinach can block the activity of an enzyme called cholinesterase which is linked to the development of Alzheimer's disease