“The treatment has to be effective, it also has to be safe and we also have to understand the right dosage to use, the right patients to give the treatment to and the right time in the illness to give that treatment.
“This is complicated stuff and the only way to unpick the signal and make sure we get it right is through clinical trials.”
Mr Hancock said he wanted to thank everyone who has stayed at home as they are “giving the NHS the time to expand so that it can save lives”.
After confirming the plans for further Nightingale hospitals, Mr Hancock said: “Since the start of this crisis, we’ve boosted the number of critical care beds to care for coronavirus by over 2,500.
“That’s before the addition we’ll get from the Nightingale hospitals.”
On PPE, Mr Hancock said more than 26 million products were delivered to 281 different organisations on Thursday.
He added he has agreed with the Northern Ireland Executive to “immediately” provide five million items of PPE to meet their needs.
“Over 7,000 NHS staff have been tested,” Mr Hancock also said.