The 29-year-old star has been living on a anti-vampire diet - which involves drinking garlic juice every day - throughout her tour to protect her vocal chords.
And the 'Hello' hitmaker has even been restricted in the conversations she's had with her husband Simon Konecki and their four-year-old son Angelo.
The source told the Daily Star newspaper: "During her tour she was on a strident vocal lockdown regime for almost a year."
"Specialists didn't want her wearing out her voice in between gigs so she was restricted to only key conversations with husband Simon and son Angelo."
"However, since she played in March, she has been allowed to go back to her normal life. Her friends always felt she was a little chatterbox, so she has been back to her old ways recently, but for the finale she is adamant that it should be her masterpiece."
Adele previously suffered a vocal-cord haemorrhage in October 2011, which forced her to cancel two tours, as she needed an extended period of rest in order to recover.
Doctors warned the star that she risked permanent damage to her voice if she didn't rest and recuperate properly.
