Based on the following quotes (non from commercial sources--most from keto diet pages around controlling epilepsy), it would appear that MCTs are helpful in inducing Ketosis.
Personally I take MCTs every morning and am in ketosis within an hour!
Perhaps each body is different.
From:
http://www.mynchen.demon.co.uk/The%...enic%20diet.htm
A much more significant variant is the MCT oil diet. MCT stand for medium chain triglycerides, which are a particular type of saturated fat found in coconut oil. MCT oil is one of the wonder ingredients of the nineties, being used by athletes to improve their performance. MCT oil is special because although it is a fat, it metabolises quickly, like carbohydrate. It does this because it can pass directly though the intestinal wall into the portal blood system and thence to the liver where it is metabolised, instead of having to go via the lymphatic system like longer chain fats. The advantage of using MCT oil is that the diet can achieve a similar energy production balance to a normal diet, but can still deliver the necessary ketones. In the typical MCT diet, the proportions will be 35% fat, 35% MCT oil, 20% carbohydrate and 10% protein (a 2.3:1 ratio). Also, the total calorie intake is set at the normal level, rather than three quarters of normal, so the MCT diet is far less rigorous than the classical diet. There does not seem to be any very clear rationale for these variations from the classical diet, except the pragmatic one that it is claimed they work, although this claim is hotly disputed.
Or from:
http://www.tricare.osd.mil/OCMO/tec...ogenic-Diet.doc
A more recent modification to the classic ketogenic diet was devised in the early 1970s in an effort to make the diet more palatable. Medium chain triglyceride oil (MCT) was employed as the primary fat product. This oil is more ketogenic per calorie than other fats, and, thus, allowed a greater flexibility in other food items, while still maintaining a ketotic state. The type of ketogenic diet is referred to as the MCT diet (Huttenlocher et al. 1971).
from:
http://www.efnj.com/ketogenic.shtml
Eighty to ninety percent of the total energy intake in the ketogenic diet is derived from fat. The energy ratio of fat to carbohydrate plus protein should be 3:1 to 4:1. If medium-chain triglyceride (MCT) oil is used, the percentage of energy from fat can be reduced. This is because MCT oil is absorbed more rapidly than other fats, is transport- ed directly to the liver, and thus induces ketosis more rapidly