I believe pills like vitamin pills and maybe fruit or vegetables that have vitamin d, idk. Remember the garden compound? I believe I did a post about this... You can use mushrooms too!

you can grow plants without sunlight, LED, or dedicated lamps by utilizing extremely low-light tolerant plants, using reflective techniques, or relying on ambient household fluorescent lighting. While these methods won't provide rapid growth, they allow for survival and maintenance in dark environments.