Interesting article about allulose at: https://www.healthline.com/nutrition/allulose#section3

Some quotes:
And here’s some good news for people who have diabetes or are watching their blood sugar — it does not raise blood sugar or insulin levels.

Allulose also provides only 0.2–0.4 calories per gram, or about 1/10 the calories of table sugar.

In addition, early research suggests that allulose has anti-inflammatory properties, and may help prevent obesity and reduce the risk of chronic disease (3Trusted Source).

Allulose may turn out to be a powerful tool for managing diabetes.

Indeed, a number of animal studies have found that it lowers blood sugar, increases insulin sensitivity and decreases the risk of type 2 diabetes by protecting the insulin-producing beta cells of the pancreas (5Trusted Source, 6Trusted Source, 7Trusted Source, 8Trusted Source).

...... a lot more there, and mostly rat and mouse studies, but they all seemed pretty promising.