Final answer:
Homeopathy is a modality not covered in the 'Heal' documentary, which entails treatments based on the principle of 'like cures like' and is administered through highly diluted doses, aiming to stimulate the body's natural healing processes.
Step-by-step explanation:
The Heal documentary covers various modalities of holistic healing, but one modality not mentioned is Homeopathy. Homeopathy is a natural form of medicine used by over 200 million people worldwide to treat both acute and chronic conditions. It is based on the principle of 'like cures like'; in other words, a substance taken in small amounts will cure the same symptoms it causes if taken in large amounts. Administered in highly diluted doses, homeopathic remedies are prescribed to match the specific symptoms of a patient, with the belief that this can stimulate the body’s natural healing process. Effects of homeopathy are reported to include alleviation of symptoms and overall improvement in health and well-being. However, it is worth noting that evidence regarding the effectiveness of homeopathy is highly debated within the medical community, with many critics arguing that any benefits are due to the placebo effect rather than the treatment itself.