Kale

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.