I asked Ray about T2. Here's our short exchange:
Very curious to hear your thoughts on the use of synthetic T2 therapeutically. I have read that it can be even more effective at raising the metabolic rate than T3. It is also currently over-the-counter, though difficult to source. The products I've seen are 150mcg per capsule, which seems quite high to me. I've seen both 3,5 and 3,3'-Diiodo-L-Thyronine. Have you read or experienced if one is more effective than the other?
Mitochondria have the enzyme for converting T3 to T2. The potency seems crazy, the body needs only about 4 mcg per hour.