Ground oats

David Fisher, The Complete Photo Guide to Soap Making (Creative Publishing International, 2018), p. 19: exfoliants, "Start with 1 to 2 teaspoons per 1 pound (454 g) of oils or soap base"; calendula petals "retain their yellow color nicely"; coffee grounds, "scrubbiness is determined by the coffee’s grind"; "Citrus peel (dried and ground): offers a medium scrub; add at trace"; cornmeal, "medium scrub; premix with oil and add at trace"; eucalyptus leaves, "a medium scrub, especially if not very finely ground"; lavender buds "will turn brown in cold process soap and look like mouse droppings; gently grind them first to avoid this"; loofah, "light to medium scrub"; mint is "prone to bleeding; steep as a tea first"; oatmeal, "like coffee, the scrubbiness is determined by how ground it is"; poppy seeds, "light to medium scrub"; pumice, "heavy-duty scrub; great for mechanic’s or gardener’s hand soaps"; rose hips, "medium to high scrub; also adds natural color"; rose petals "turn black in cold process soap"; sandalwood powder "gives a medium to high scrub, and makes a lovely purple color"; "ground stone fruit pits (apricots, peaches) and berry seeds (ground or whole) give a medium to high scrub factor"; walnut shells, "a nice medium scrub and a lovely medium brown color".

Lovin Soap, soapmaking additive chart: clay 1 teaspoon, oatmeal, coffee grounds and cocoa 1 tablespoon per pound of oils; cocoa into the warm oils; silk, "1 pea size pinch per pound of soapmaking oils".

Susan Miller Cavitch, The Natural Soap Book (Storey Publishing, 1995), chapter 6: clay, "add the clay to your soap just before pouring into molds, using ½ to 1 cup (118 to 237 ml) for a 12-pound (5.45 kg) batch of soap. Before adding the pure essential oils, blend the clay with 2 cups (473 ml) of soap mixture in a small container" (pp. 62–63); "Oatmeal, cornmeal, flax seed meal, juniper berry meal, alfalfa meal, flaked seaweed, and jojoba meal can all be added to soap for texture. Oatmeal, jojoba meal, and alfalfa meal exfoliate gently. Juniper berry, flaked seaweed, and flax seed meals are more coarse, with sharper edges; finely grind them before adding as exfoliants to soap"; "½ to 1 cup (118 to 237 ml) of meal is suggested for a 12-pound (5.45 kg) batch of soap", added "immediately after the soap has saponified" (pp. 66–67). ½–1 cup for 12 pounds is 0.67–1.33 tablespoons per pound of soap.

Elizabeth Letcavage and Melissa Harden, Natural Soap Making (Stackpole Books, 2013): calendula "is the only flower that will keep its yellow color through the saponification process. Other flowers ... will turn brown or black"; "Lavender flowers will have a nicer appearance in soap if they are slightly ground"; light additives "(such as seeds, grains, or lavender flower buds)" are added at "heavy trace" to stay suspended; "Leaves of herbs such as mint, nettle leaf, and lemon balm are dried before use"; "Ground Nettle Leaf 2–3 teaspoons", "Ground Oats ¼ cup" and "Ground Cornmeal ¼ cup" in recipes of 48 oz of oils, added at light trace; the Basic Three-Oil Soap, 48 oz of oils, takes "½ cup ground oats or other additive".

Casey Makela, Making Natural Milk Soap (Storey, 1999; from Milk-Based Soaps, 1997): "Herbs will not keep their original color; most fade in reaction to the lye"; "½ cup (118 ml)" of cornmeal, "½ cup" of raw almonds blended "to a medium-coarse powder", ¾ cup of dried lavender flowers or rose petals, and "½ cup (118 ml) rolled oats" blended "to a medium-coarse powder", per batch of about 85 oz (2410 g) of oils, added "to the liquid when it’s blended for the first time"; "1 ounce (28.4 g) borax" in every recipe, added to the oils with the sugar and glycerin as the lye-milk goes in; soap "light brown if you use cinnamon and cloves".

David Fisher, The Complete Photo Guide to Soap Making (Creative Publishing International, 2018): rebatched soaps, "1 tablespoon (6 g) red sandalwood powder" for 1 lb (454 g) of grated soap, and "1 tablespoon (1.5 g) lightly crushed rose petals buds" for a pound (p. 34); "1 to 2 tablespoons (5 to 10 g) ground walnut shells" in one third of 28 oz (794 g) of grated soap (p. 32); "1 tablespoon (9 g) kaolin, bentonite, or French green clay" in another third and "1 teaspoon activated charcoal—a little goes a long way" in the last (p. 32); "2 tablespoons (10 g) lightly ground oatmeal" for 1 lb (454 g) of grated soap (p. 32); in melt and pour, "¼ teaspoon cosmetic glitter" in about 4 ounces (112 g) of clear base (p. 54); in cold process, "2 teaspoons activated charcoal per 1 lb (454 g) of soap oils" (p. 121), and for the three colours of a clay swirl "½ teaspoon rhassoul clay", "½ teaspoon green sea clay" and "½ teaspoon red Moroccan clay", each mixed with 3 tablespoons (45 ml) of distilled water (pp. 121–122).

Cosmetic Ingredient Review, Avena sativa (oat) ingredients (2014): kernel flour up to 84.4 % in skin cleansing products and kernel meal up to 1 % in bath soaps and detergents; "several reported cases of atopic dermatitis".

The highest concentration reported to CIR in industry surveys: what has been used, not a recommendation.

USDA FoodData Central, food 173904: Oats, rolled.