L-Threonic acid is a natural constituent in leaves of Pelargonium crispum (L.) L'Hér (lemon geranium) and Rumex x acutus L. (sorrel). In both species, L-[14C]threonate is formed after feeding L-[U-14C ...
L-Ascorbic acid, more familiarly known as vitamin C, is widely found in nature. It is particularly abundant in citrus and stone fruits, berries (especially acerola), peppers, and green vegetables.