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Supports Healthy LiverHerbal SupplementApproved by Michael Tierra L.Ac O.M.D.Planetary Herbals FULL SPECTRUM™ MILK THISTLE SEED EXTRACT is a highly concentrated extract of milk thistle seeds (Silybum marianum) that modern research has shown to support a healthy liver. This extract matches the constituent profile of extracts used in human research studies. Extra milk thistle seeds are added to ensure the presence of important secondary compounds.