Hello Dionne,
I understand your concern and reluctance to use the product. You can read more about zeolites at www.liquidzeolites.org. Here you will find the scientific research in regards to this product. It is on the FDA GRAS list as generally recognised as a SAFE product. I have witnessed many people use this product and all have had favourable results.
Because of your concern I recommend that you start slowly and increase your dosage gradually. IE. start off with one drop or even less if you like by diluting this one drop in some water and taking one drop of that solution. Then if there are no adverse reactions increase the dosage every couple of days until you have worked up to the 60 drops per day.
The cellular product if it is the one made by Waiora has undergone a process to clean the cage like structure so you are starting with an empty cage whilst the powdered form has some toxins already existing simply because it exists in nature. Zeolites have been used for over 800 years.
I believe this product will do more good than harm for your Dad. I pray for healing for your Dad.
All the best
Michelle