Macrophages and other phagocytes are found in the following locations in the body:
| Main location | Types of phagocytes |
| Skin * | macrophages, resident Langerhans cells, dendritic cells, mast cells |
| Gut and intestinal Peyer’s patches * | macrophages |
| Lungs * | macrophages, monocytes, mast cells, dendritic cells |
| Blood | neutrophils, monocytes |
| Bone marrow | macrophages, monocytes, sinusoidal cells, lining cells |
| Connective tissue | macrophages, monocytes, dendritic cells, histiocytes |
| Lymphoid tissue | macrophages, monocytes, dendritic cells |
| Spleen | macrophages, monocytes, sinusoidal cells |
| Thymus | macrophages, monocytes |
* These locations offer the best sites for GcMAF administration. The skin by subcutaneous (SC) or intramuscular (IM) injection, the gut by oral administration and the lungs by inhalation using a nebulizer (such as Omron NE-U22V Portable Nebulizer).