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Jarrow is 30:1, the Medi Herb one I bought is the 70:1. What this means? I have no idea!
However, this I can answer for you. When herbs are standardized to a certain percentage what they are telling you is that in the total composition of the capsule/tablet/dropperful/etc contains that percentage of the active ingredient of the herb. So Jarrow at 30:1 means that each capsule/tablet/dropperful/etc has 30% of the MT and the Medi Herb at 70:1 contains 70%. My Squirt takes 40mg flax lignans capsules which are standardized to 20%. This means there are only 8mg of the SDG (active ingredient of lignans) in each capsule.