NOVELTY - Cosmetic composition (A1) comprises a polymer and at least one cosmetic additive. The polymer comprises at least one crosslinked monomer unit. The crosslinked monomer unit is substituted acrylamide monomer unit (I).    USE - (A1), (A2) or (A5) is useful: for providing nutrients to skin (claimed), where the skin is skin of a subject's face, nose, mouth, eyes and/or ears, leg, arm, back etc or animal's skin comprising pets, food source animals and/or farm animals; as skin cleansers, moisturizers, lotions and creams, self tanning products, makeup, hair care and nail care products, facial cosmetic, antiwrinkle cream, sunscreen, foundation, lipstick, gloss, perfume, deodorant, hair spray, shampoo, shaving cream, mascara and/or antiperspirant; in cell growth media, hydrogel, baby diapers, organ manufacture, tissue engineering, tubing sieves and/or construction; and as a scaffold material or food additive.    ADVANTAGE - The cosmetic composition: utilizes polymer, which is non carcinogenic, lower viscosity solution, can be used at high concentrations, does not release toxic material, is less acidic degradation product, eliminates inflammatory response, has strong affinity for water, has superior moisturizer, is environmentally friendly and biodegradable, has oxygen which does not inhibit polymerization and/or provides energy source for cell growth and skin health, when compared to traditional acrylamides; utilizes the polymer, which exhibits excellent utility in cosmetics and provides the product with more pleasing, palatable and attractive to the user and/or customer; and utilizes polymer, which has lower risk and/or likelihood of inducing allergies to a subject who is allergic to traditional forms of polyacrylamide.    DETAILED DESCRIPTION - Cosmetic composition (A1) comprises a polymer and at least one cosmetic additive. The polymer comprises at least one crosslinked monomer unit. The crosslinked monomer unit is substituted acrylamide monomer unit of formula (I).    X1, X2 = bond or 1-6C alkylene;    L1, L2 = -NH-, S or O;    Y1m = H, OH, saturated 1-24C alkyl, unsaturated 2-24C alkenyl, 2-24C alkynyl, -NR1A1R1B1, -NR1A1C(O)R1B1, -R1C1NR1A1R1B1, -R1C1NR1A1C(O)R1B1, -C(O)NR1A1R1B1, -OC(O)NR1A1R1B1, -C(O)R1A1, -R1C1C(O)R1A1, -R1C1OC(O)R1A1, -C(O)OR1A1, -R1C1C(O)OR1A1, -OR1A1, -R1C1OR1A1, -SR1A1, -R1C1SR1A1, -S(O)q, -S(O)qR1C1, -OS(O)q, -NS(O)q, -NS(O)qR1C1, -P(O)qR1C1, -OP(O)q, -NP(O)q, -NP(O)qR1C1 or their substituted version;    R1A1, R1B1 = H, 1-6C alkyl, unsaturated 2-6C alkenyl or 2-6C alkynyl;    R1C1 = bond or 1-6C alkylene;    q = 1-3;    m = 0-18;    Z1-Z3 = single bond, double bond, -CH2-, -CH(OH), -CH=, -CH2CH2-, =CH-CH2, =CH-CH=, -CH=CH-, -CH2-CH2-CH2-, =CH-CH2-CH2-, =CH-CH2-CH=, =CH-CH=CH- or -CH=CH2-CH-2 (all optionally substituted with 1-4 of Y1m or X1 or X2);    R1-R6 = H, 1-24C alkyl, unsaturated 2-24C alkenyl or 2-24C alkynyl (all optionally substituted); and    dashed line = double bond or single bond.    INDEPENDENT CLAIMS are also included for:    (1) a cosmetic composition (A2) comprising a polymer and at least one cosmetic additive, where the composition comprises less than 0.2 wt.% of acrylamide monomer and the polymer comprises acrylamide monomer unit of formula (VI);    (2) acrylamide heterocyclyl compounds of formula (XI);    (3) preparing a polymer comprising polymerizing at least one monomer to form polymer, where the monomer includes a first monomer comprising (XI) and/or substituted acrylamide monomer (XV);    (4) a polymer (A3) comprising at least one crosslinked monomer unit, which is (I);    (5) a polymer (A4) comprising monomer unit (VI); and    (6) a cosmetic composition (A5) comprising a pyranose polyacrylamide polymer or pyranose polymethacrylamide polymer and at least one cosmetic additive.    Y2m1 = H, OH, saturated 1-24C alkyl, unsaturated 2-24C alkenyl, 2-14C alkynyl, -NR1A1R1B1, -NR1A1C(O)R1B1, -R1C1NR1A1R1B1, -R1C1NR1A1C(O)R1B1, -C(O)NR1A1R1B1, -OC(O)NR1A1R1B1, -C(O)R1A1, -R1C1C(O)R1A1, -R1C1OC(O)R1A1, -C(O)OR1A1, -R1C1C(O)OR1A1, -OR1A1, -R1C1OR1A1, -SR1A1, -R1C1SR1A1, -S(O)x, -S(O)xR1C1, -OS(O)x, -NS(O)x, -NS(O)xR1C1, -P(O)xR1C1, -OP(O)x, -NP(O)x, -NP(O)xR1C1 or their substituted version;    x = 1-3;    m2 = 0-19; and    Z11-Z13 = single bond, double bond, -CH2, -CH(OH), -CH=, -CH2-CH2-, =CH-CH2-, =CH-CH=, -CH=CH-, -CH2-CH2-CH2-, =CH-CH2-CH2-, =CH-CH2-CH=, =CH-CH=CH- or -CH=CH2-CH2 (all optionally substituted with 1-4 of Y2m1 or X1).