Do green tea supplements (mega-t) help you lose weight?

I'm 30f and a big girl 5'9 235. I AM trying to work out by walking the treadmill 45 mins 5 days a week. I'm just looking for a little help. I have asthma, arthritic knees, and diabetes and there is only so much physical activity I can do at this point. I know from personal exp. that most weight loss supplements are scams. But I've heard green tea is actually beneficial if you take enough of it. Does it work in the form of a pill, too?

Someone reverse-engineered a weight loss capsule to discover green tea. I have not read of any study indicating it helps.
There is an herb from Africa that is supposed to help but its very expensive. Hoodia ?
I take 1 or 2 tablespoons of coconut oil on anything prior to a big meal two times a day. The coconut oil helps with
1) reduce hunger because you have some fat in your diet to satisfy the urge
2) increase metabolism to burn more calories during the meal
but it does not appear to the body as fat so it is not stored as fat. It is a medium length molecule that 'looks' different.
I figure the cost of it is offset by food savings.
I think that treadmill walking will not raise your heartrate enought to help. You need to exert more energy - like a fast walk to make you puff.

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