## 1 Introduction  
The return to nature and rediscovery of its resources have become a key trend in contemporary industry, science, and consumption. The efforts to reemploy the natural properties of long-forgotten plants (such as milk thistle and borage) aim to popularise such materials in accordance with the European's environmentally friendly policies. This is important because these plants have valuable properties facilitating the correct functioning of the human body in medicine and biocosmetics [1]. It has been reported that \(\gamma\)-linolenic acid contained in borage oil is effective against atopic dermatitis [2]. The research demonstrated that children who had worn undershirts coated with borage oil for 2 weeks showed improvements in their erythema and itch, which were statistically significant. Transregional water loss from the back was decreased. The undershirts coated with borage oil were found to be statistically effective, and had no side effects for children with mild atopic dermatitis [2]. Milk thistle has been used to treat various diseases for years. Many studies suggest a positive role for milk thistle in liver protection and regeneration [3; 4; 5]. [PERSON] and [PERSON] [3] showed that the administration of an adequate amount of silybin restores the oxidative-antioxidant balance and reduces inflammation biomarkers and immunomodulation in induced liver oxidative stress in rats. [PERSON] et al. [4] found that the silymarin in milk thistle promotes hepatic glutathione production, which enhances antioxidant defences in mouse liver models. The health effects of milk thistle have also been proven in human studies. [PERSON] et al. [5] revealed a statistically significant reduction in lipid peroxidation in patients with alcoholic cirrhosis after the administration of silymarin from the dry extract of the fruit of the _Silybun marianum_ plant [5]. There have been a growing number of dietary, cosmetic, and pharmaceutical breakthroughs relying on the bioactive substances present in plants rich in polyunsaturated fatty acids from the n-3 and n-6 families, as well as \(\gamma\)-linolenic acid (GLA), the prostaglandin precursor, with many tracing back to the two plants mentioned above. In the case of milk thistle and borage, the industrial-grade material consists primarily of seeds and the oils extracted from the same [6]. The most valuable oil is obtained in the process of cold pressing. With such treatment, both borage (_Borago officinalis_ L.) and milk thistle (_Silybun marianum_ L. [PERSON]) can be a source of a number of valuable compounds with proven medicinal and cosmetic benefits. Such compounds are necessary ingredients of a healthy human diet that cannot be synthesised, and therefore should or even must be obtained from plant sources [7]. However, milk thistle seed oil is considered one of the most valuable products of natural origin due to its multiple and complex healing properties. Milk thistle seed oil has also been documented as a potential natural source of vitamin E and has often been recommended as a favourable edible oil [8]. Milk thistle has a number of confirmed health benefits, verified by documented research results that list it among alternative medicines facilitating the treatment of liver- and bile-related ailments [9]. Its anti-inflammatory properties allow it to be used as an ointment applied on pruritic, psoriatic, exiscated, burned, or frostbitten skin [10]. Oils obtained from the two plants are a rich source of lipophilic compounds, tocoperbols (vitamin E), counted as some of the most potent natural antioxidants, carotenoids, docochromanols, phytosterols, and squalene, showing significant health benefits, as well as sterols (cholesterol, campesterol, stigmasterol, and sitosterol) [11], sugars (arabinose, rhamnose, xylose, and glucose), and flavonoids, contributing to protection of the liver against toxins [12].