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Increasing amounts of NADPH (1250 M) were subsequently added to the wells and the solutions were imaged on an LSM880 confocal laser scanning microscope (Carl Zeiss AG, Oberkochen, Germany) with a 63x immersion objective (LD LCI Plan-Apochromat 63x/1.2 Imm Corr DIC M27) using a 440 nm pulsed excitation laser (LDH-D-C-440, 40 MHz repetition rate) managed by a PicoQuant FLIM module (Sepia PDL828-S, PMA Hybrid 40, MultiHarp 150 4N, Time Harp 260 PICO Dual) (PicoQuant, Berlin, Germany)

It's a question that comes up a lot, and the short answer is that high B12 levels by themselves don't typically cause symptoms

Pop et al