Aaron Barry scored a late equaliser to deservedly net the Blades a share of the spoils at Forest's Wilford Lane training complex
After a quiet first half, United, who again included former Greek international Angelos Charisteas as a trialist, fell behind against the run of play just before the hour mark.
The Blades, who adopted a 3-4-3 formation against the Reds, responded immediately but Joe Ironside missed a glorious chance to level from the restart.
The visitors continued to look threatening and after the referee adjudged Ironside had been man-handled in the penalty area, Elliott Whitehouse missed the resulting spot kick.
Whitehouse refused to let that penalty miss bother him and moments later the midfielder headed just wide from a corner.
As time passed by United looked the only team likely to score and after the home goalkeeper pulled off two world class saves, the Blades duly got their reward their pressure warranted.
In the 83rd minute, after a corner wasn't cleared, BARRY managed to force the ball home at the back post.
Speaking afterwards, Chris Morgan praised the application of his players and felt his side deserved to take all three points: "It was a good game and one we certainly deserved to win. I was delighted with how the lads adapted to how we changed the formation around.
"We created numerous chances and in the end deservedly got a point, but with the chances we had we really should have won the game.
"The youngsters equipped themselves really well and as always it was good to get 90 minutes into Darryl (Westlake) and Marcus (Williams).
"What pleased most was that we didn't give up, even when the ball wasn't bouncing our way."
Blades: Dewbury, Westlake, Williams, McFadzean, Kennedy, Barry, De Girolamo, Whitehouse, Ironside, Charisteas (Cribley 70), Tonne.
Unused: Smith, Khan, Banton, McDonagh.