Hello,
If your hair is falling then most probably its in the falling stage so if even if its 50-100 hair strands/day its okay but hair bless mainly contain biotin and other essential minerals good for hair stuff so stopping it shouldn't create much difference until you are deficient for those nutrients.
Next Steps
Yes its completely safe to take this tablet for long duration.
For any hair supplement, its a dictum to take for at least 6 months as it can actually support growth phase of your hair cycle.
Health Tips
But only supplements might not help with your hair fall problem so it would be better if you seek a medical help.
For further details for hair related treatment and tips we always do a teleconsultation especially during this lockdown period