This'll depend on the type of supplement in question along with the circumstances you're dealing with.
With very few exceptions (e.g. emergency situations), the following is a list of some of the many supplements that are NOT recommended:
- Coenzyme Q10
- Colloidal Silver
- Creatine
- Digestive enzymes
- Fish oil
- Isolates (vitamins, minerals, fatty acids, amino acids, neurotransmitters, etc.)
- Probiotics
- Protein powders (both whey and plant-based; not necessary)
Instead, you’re encouraged to use whole food supplements, including:
- Alfalfa (Lucerne) (plant and sprouts)
- Bovine glandulars (only if needed and until no longer necessary)
- Kelp (powdered)
- Moringa oleifera
- Quality superfood blends WITHOUT added digestive enzymes, probiotics, and blue-green algae
Most supplements aren't recommended as you'll be receiving the necessary nourishment from the botanicals, fruits, and vegetables.
Also, many people don’t have the affordability to spend money on supplements that don't assist in addressing the root cause(s) of their health problems but rather treat, suppress and/or worsen their problem(s).