How about some simple DIY product like Sliced Lemon infused in water?

First, how much is the price? Any hint of MLM elements?
Second, the ingredients are common. If is expensive, just do yourself.
Fibre -psyllium husk. Eat more papaya, green veges
Probiotic - make your own kimchi/yogurt
Supplements - can be found at local pharmacy

The above is cheaper in the long run.

Yeah. Why Stop there? Blend up oganic veges (I never said fruits). If too expensive, get vege wash to remove all kind of chemical on the veges. Go to your nearest pharmacy, ask for calcium cabonate tablets. Drop one in and blend your veges and lemon together. The calcium carbonate to precipitate out the oxalate in green veges. Drink that. You can use broccoli, spinach, carrot, tomatoes,  capsicum, celery, whole lemon (whole lemon better than lemon juice), cabbage, purple dragon fruit, bananas, almonds, walnuts, pumpkin seed,  pineapple, garlic, turmeric (add black pepper and 1 tsp-1tbsp of virgin coconut oil for maximum absorption of turmeric).

Be creative!!! The green drink will take some getting used to.

I start my day with the following shake and "tea"  with the following supplement:
Also, exercise. Diet alone is not going to help you. You need exercise.