Aloe vera is a type of cactus in Liliaceae family. Its inner gel has been used medicinally for millennia: Nefertiti and Cleopatra used it as part of their regular beauty regimes, and Alexander the Great used it to treat soldiers’ wounds. You can grow it fairly easily yourself, but take caution: the dark green exterior is poisonous, and it looks strikingly similar to other, more toxic plants in the same family.
Aloe can help make your body produce collagen, the key to firm, elastic skin. According to research, “Glucomannan, a mannose-rich polysaccharide, and gibberellin, a growth hormone, interacts with growth factor receptors on the fibroblast, thereby stimulating its activity and proliferation, which in turn significantly increases collagen synthesis”   So, now you know.
UV radiation and sun exposure
The mucopolysaccharides in aloe help bind moisture to the skin without increasing oiliness. It also softens the skin by helping dead, flaking skin cells stick together. Amino acids also soften hardened skin cells and zinc acts as an astringent to tighten pores. 
Aloe vera contains 6 antiseptic agents: Lupeol, salicylic acid, urea nitrogen, cinnamonic acid, phenols and sulfur, all of which can inhibit the growth of fungi, bacteria and viruses.
Find it in:
 Surjushe, A., Vasani, R., & Saple, D. (2008). Aloe vera: A short review. Indian Journal of Dermatology, 53(4), 163. [https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2763764/]
 Chithra R Sajithlal GB, Chandrakasan G. Influence of aloe vera on collagen characteristics in healing dermal wounds in rats. Mol Cell Biochem. 1998;181:71–6. [PubMed]
 Davis, R., Donato, J., Hartman, G., & Haas, R. (1994). Anti-inflammatory and wound healing activity of a growth substance in Aloe vera. Journal of the American Podiatric Medical Association, 84(2), 77-81. [http://europepmc.org/abstract/med/8169808]
 Surjushe et al.
 Vázquez, B., Avila, G., Segura, D., & Escalante, B. (1996). Antiinflammatory activity of extracts from Aloe vera gel. Journal of Ethnopharmacology, 55(1), 69-75. [http://www.sciencedirect.com/science/article/pii/S0378874196014766]
 Sato Y, Ohta S, Shinoda M. Studies on chemical protectors against radiation XXXI: Protective effects of Aloe arborescens on skin injury induced by x-irradiation. Yakugaku Zasshi. 1990;110:876–84. [PubMed] [Ref list]
 Surjushe et al.