Depends on what TS eat and do on an average day.
Also depends on where you stay.

If you live in the city then you will need to take supplement.
I do not recommend vitamin C unless you are sick.
If you take Vit C but then fall sick then Vit C will not be as effective.

It is good that TS stop protein shake when not active in gym.

If you do not eat properly and lack fiber in food then take probiotic
Otherwise probiotic is another excess that bulks up your colon.
If you use the sesarch function and see comments in LYN then you will find half the comments to take supplements are generally trying to promote those supplements. So if you want to know what type of supplements to take then first list down what you eat daily and for a week.

whey protein is more for workout purpose & muscle recovery.
Did they take any other food beside that?

Lol. Waste of protein this is..

huh? still need to have balance diet la......
whey protein can't be your meal replacement......