As a member of the Brassica family, Radish leaves should be fed in moderation, because all members of this family contain glusinolates (goitrogenic glycosides) which can interfere with thyroid function and possibly cause kidney and liver damage if fed as a major part of the diet (but small quantities should be fine).
Do not feed the radish root, as this is very high in glusinolates and also carbohydrates.
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