While some sources say there are no known hazards with Hoary Cress, others do state that young leaves could contain glucosinolates and hydrogen cyanide, which in small quantities are harmless but in larger doses can be toxic, so this plant should be fed in moderation only and as part of a varied diet.
Please be aware
that two or more goitrogenic plants should not be fed in conjunction
with each other, and the sum total of goitrogenic foods should not
exceed the guideline for a single plant of 'in moderation' (amber-green)
or 'sparingly' (amber-red). This will ensure that goitrogenic
consumption stays within safe limits.