Kale
Brassica oleracea var. acephala
Also known as: curly kale, lacinato kale, dinosaur kale
Safety by species
Russian Tortoise
Agrionemys horsfieldii
Goitrogenic — contains glucosinolates that suppress thyroid function when fed excessively. High in calcium which is a positive, but the goitrogen risk makes it unsuitable as a staple.
Hermann's Tortoise
Testudo hermanni
Goitrogenic. High calcium but unsuitable as a staple.
Greek Tortoise
Testudo graeca
Goitrogenic. High calcium but unsuitable as a staple.
Sulcata Tortoise
Centrochelys sulcata
Goitrogenic — more concerning for large Sulcata that may eat substantial quantities. Limit strictly.
Leopard Tortoise
Stigmochelys pardalis
Goitrogenic — limit to occasional use only.
Red-footed Tortoise
Chelonoidis carbonarius
Goitrogenic glucosinolates — limit to occasional rotation. Same thyroid risk as for other tortoise species.
Eastern Box Turtle
Terrapene carolina
Goitrogenic — rotate with other greens rather than feeding daily.
Red-eared Slider
Trachemys scripta elegans
Goitrogenic — limit to occasional rotation with other greens.
Yellow-bellied Slider
Trachemys scripta scripta
Goitrogenic — rotate rather than use daily.
Painted Turtle
Chrysemys picta
Goitrogenic — rotate with other greens rather than feeding daily.