Amongst the modern problems of brain physiology, special attention is drawn to the transport processes in the brain’s extracellular space, which are crucial for understanding metabolic exchange, waste clearance, etc. At the same time, the complexity of direct registration of such processes in vivo forms a demand for developing artificial phantoms with properties resembling the brain’s parenchyma as models suited for testing different physical approaches to describing the respective spread of substances. Here we describe a novel hydrogel material with composition and structure adjusted to this goal. The phantom comprises a collagen network with the addition of lipids and catches water content close to that of the brain. The results of electron microscopy and computer tomography studies as well as exploration of peculiarities of the fluorescent marker spread argue that this compound material is prospective for its use for mimicking the brain’s tissue.