In a honey base using steam displacement process. It is available in a liquid form. One of the more general ones that has been found effective for many people is Planetary Formulas Red Clover Cleanser . It is available in tablet form. Banyan Botanical's formula is new, based on traditional Ayurvedic principles, but I have no clinical experience with it nor feedback from persons who are using it.
Longer use is therefore probably advisable.
Most such products work better if combined with something that aids elimination . In general, blood detoxifiers are not needed long-term. However, they may be needed in higher than recommended dosages in the early stages of treatment, perhaps for some weeks or months. Usually, the dosage can be reduced as the symptoms of toxicity subside. If in doubt about how much to take and for how long, consult a health care practitioner.