Page 253 - Cosmetology
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miraculous results, but the positive outcome in terms of skin health is indisputable. However, it is highly
                   possible that using tretinoin on the skin will cause irritation, which is a major drawback of this drug. See
                   tretinoin.

                   retinol. If the layers of connective tissue beneath the skin on the thighs are indeed the main cause of
                   cellulite (along with excess or poorly formed fat deposits) then improving skin structure should, theoretically,
                   make a difference. There is growing evidence proving this to be the case. Retinol (the entire vitamin A
                   molecule) is one of the ingredients known to help improve skin structure. Of all the ingredients to look for in
                   a cellulite product this should be at the top of the list. However, most cellulite products contain teeny
                   amounts of retinol (at best) and are often in packaging that won’t keep this air-sensitive ingredient stable.
                   One other point: Johnson & Johnson has a study showing the combination of retinol, caffeine, and
                   ruscogenine can reduce the appearance of cellulite. Of course J&J-owned companies RoC and Neutrogena
                   both sell cellulite products with that combination of ingredients.

                   retinyl palmitate. Form of vitamin A. It is a combination of retinol (pure vitamin A) and palmitic acid. There
                   is research showing it to be effective as an antioxidant and skin-cell regulator.

                   rhatany. See Krameria triandra extract.

                   Rhus succedanea. See Japan wax.

                   riboflavin. See Japan wax.

                   riboflavin. See vitamin B2.

                   ribonucleic acid. See RNA.

                   rice bran oil. Emollient oil similar to other nonfragrant plant oils. There is no research showing this to have
                   superior benefit for skin.

                   rice oil. Emollient similar to other nonfragrant plant oils. There is no research showing this to have superior
                   benefit for skin.

                   rice starch. Absorbent substance sometimes used instead of talc. It can cause allergic reactions and,
                   because it is a food derivative (as opposed to a mineral derivative like talc), it can support bacterial growth in
                   pores.

                   ricinoleate. Glyceryl triester used in cosmetics as a thickening agent and emollient.

                   Ricinus communis. See castor oil.

                   RNA. Ribonucleic acid is a single strand of molecules, exactly copied from DNA in the cell nucleus, that is
                   required for the body's production of protein. This single strand is a linear, ladder-like sequence of nucleotide
                   bases (chemicals that form its structure) that corresponds precisely to the sequence of bases in the DNA
                   strand (the core of the body's genetic makeup). RNA in a skin-care product is useless because it cannot
                   affect a cell's genetic elements. The production of DNA and RNA is an extremely complex process that
                   requires a multitude of proteins and enzymes to have its effect on the body's genetic material. It is also
                   doubtful that you would ever want to put anything on your skin that could affect your genetic material, and
                   particularly not via a cosmetic that has no safety or efficacy regulations.

                   Robinia pseudacacia extract. See black locust extract.

                   rockrose oil. See labdanum oil.

                   Rosa canina. See rose hip oil.

                   Rosa centifolia. See rose hip oil.

                   Rosa damascena oil. A very fragrant pink rose, used as fragrance in cosmetics.

                   Rosa eglanteria. See rose hip oil.
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