Fibre is actually the cell wall of edible plants, and it comes in two forms—soluble and insoluble fibre.
Soluble fibre can be dissolved in water; as it passes through our digestive tract it absorbs water, making us feel fuller and contributing to weight loss.
Insoluble fibre is not dissolved and passes through our digestive tract without changing much at all. Insoluble fibre is used mostly to improve the quality of bowel movements.
For the purposes of detoxification, both types of fibre can be of benefit.
Rather than focusing on one specific fibre supplement, incorporating more fibre-rich foods, such as beans, lentils, seeds, whole unprocessed grains, fruit, and vegetables, will benefit your detoxification immensely.
If you want to boost your fibre with food, try chia seeds—1 oz (around 2 Tbsp/30 mL) contains 11 g of fibre, about one-third of the recommended 25 to 38 g per day.