Viewers saw Gemma using Japanese reiki healing techniques on Darren Day over the weekend, to help cure his constipation.
"I am so impressed with you," said Gillian.
"It's amazing that you have that interest. There is so much we can do together. The fact you're open to reiki has changed my whole opinion of you as I thought you'd be really resistant to it."
Gemma said she had a "massive" interest in reiki, explaining: "I think I pick up on people's emotion and energy and I'm very susceptible to it, and it's hard to close yourself off in here."
TV nutritionist and wellness expert Gillian entered the CBB house last night as part of a new task that involves banishing all toxicity from the house.
She picked Stephanie, Scotty T, John and Tiffany as the most toxic housemates and sent them to her special clinic where they will undergo a thorough detox to purify their bodies and minds.
Gillian did warn Gemma: "Gemma, honey, I wanted to pick you, but you're ill so I can't pick you tonight. I have my eye on you."
CBB continues tonight at 9pm on Channel 5.