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Caitlin MacKenna writes in Increase a Cup Size in 30 Days with Breast Massage:

If you massage your breasts for 20-30 minutes a day, they should grow one cup size larger in 30 days.

Massage does two things to stimulate growth. One benefit of massage is increased circulation. Since phytoestrogens travel through the bloodstream, the more blood you have flowing to your breasts, the easier it is for your breast receptors to pick up what they need in order to grow. Another benefit of massage is prolactin production. This important breast-enlarging hormone is triggered by regular stimulation of the breasts and nipples.

[…]

This method of breast massage is a part of an ancient Taoist exercise, the female deer exercise. That means it has been used and tested for hundreds, possibly thousands of years. All you need is some time, your hands, and dedication to have larger breasts in just 30 days.

Does enlargement result as an effect for an average woman who massages her breasts as Caitlin MacKenna suggests?

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    Is this actually a notable claim? It just seems to be a quack with a blog, attempting to cash in on spam links. Quite possible Caitlin MacKenna is famous and I just haven't heard of her, though. – ChrisInEdmonton Oct 27 '15 at 12:59
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    As the article describes that the technique she proposes is a taoist technique called "female deer exercise". If you google that term you will find other sources making same or a similar claim. To me that's enough for the claim to be worthy of debunking if it is false. – Christian Oct 27 '15 at 13:12
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    Anecdotal evidence: I have heard generic claims from Japanese sources, of fiction and non-fiction works, promoting that "women who want to make their breasts size larger should massage their breasts" and sometimes varied by "[...] should [let their partner to] massage their [women] breasts". – clearkimura Oct 27 '15 at 19:08
  • Note that "many people claiming stuff on minor blogs" is very good evidence of notability. – Sklivvz Sep 13 '18 at 6:10
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    Plenty of more (similar) quackery in this online new-age book – Sklivvz Sep 13 '18 at 6:15

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