The expression of bioactivity depends on the assimilation of different classes of natural substances (e.g., phenolic compounds) in vivo. Six functional extracts (Aspalathus linearis, leaves; Paullinia cupana, seeds; Aristotelia chilensis, berries; Ilex paraguariensis, leaves; Syzygium aromaticum, cloves, and wild berries) were analyzed in vitro and in vivo as an alternative to alleviating pathologies associated with oxidative stress (proliferation of cancer cells). The purpose of this research was to evaluate the in vitro and in vivo antioxidant and cytotoxic potential of hydroalcoholic solutions, in addition to the assimilation capacity of bioactive components in Saccharomyces boulardii cells. In vivo antioxidant capacity (critical point value) was correlated with the assimilation ratio of functional compounds. The results of in vitro antioxidant activities were correlated with the presence of quercetin (4.67 ± 0.27 mg/100 mL) and chlorogenic acid (14.38 ± 0.29 mg/100 mL) in I. paraguariensis. Bioassimilation of the main nutraceutical components depended on the individual sample. Phenolic acid levels revealed the poor assimilation of the main components, which could be associated with cell viability to oxidative stress.

Plants with therapeutic potential are a rich resource for the inhabitants of a country, with Romania among them, having a diverse flora not only from plants but also from fungi. New trends in biopharmaceuticals are also addressed in studies related to topical administration, representing a great advantage; research has determined biological activities in vivo and in vitro. This study aimed to present the main active compounds from extracts of Lactarius piperatus, Centaurea cyanus, and Ribes rubrum. In vitro (DPPH scavenging activity and reducing power) and in vivo activities were determined. A survey of hydrating cosmetic products and the completion of a patch test (in vivo test) under dermatological control were realized to confirm the skin compatibility of the product in a panel of human subjects after a single application. The cosmetic product did not induce allergic reactions, erythema, irritation, or itching. This study showed that the extracts incorporated in the formulation of the face cream had a nutricosmetic effect. The research demonstrated a result of increasing skin elasticity and an anti-inflammatory effect following direct application to the skin of volunteers. The product offered in vitro/in vivo protection against the action of free radicals; it was effective in reducing the side effects of exposure to the action of blue light.