Identify the fibre
Read the ingredient list first. Psyllium husk, PHGG, acacia fibre, resistant dextrin and inulin have different properties. A blend name does not tell you which materials it contains or their proportions.
Compare fibre per serving with the serving weight. A 10 g scoop can contain flavourings, sweeteners and other ingredients as well as fibre. Use the declared fibre amount when comparing products.
Check preparation and suitability
Look for the liquid volume, mixing method and any timing instructions. These matter particularly for a powder that thickens after mixing. Read the suitability and medicine precautions alongside the serving directions.
Read the claim and the evidence together
A claim should identify the benefit being discussed and the conditions that support it. Evidence for an ingredient at one amount does not automatically support a finished blend at a different amount.
Ask the supplier about quality information if it affects your choice. A clear label helps you understand the product; it does not, by itself, prove testing or effectiveness.