G'day, I'm T1, but Basil refers to a long term background insulin lasting approximately 1 day, where-as Bolus it typically a mealtime dose of faster acting insulin.
Ahhhh probably obvious but you take it via an injection using a syringe or insulin pen.
Good for? Basil insulin smoothes out out your blood sugar levels with much less risk of hypoglycemia. Think gradual change as opposed to rapid.
Many take their Basil insulin at night as I did for 25 odd years but I've switched to mornings with better results. I can't remember the reasons for the change possibly because of inconsistent bedtimes ( e.g. out partying ;-) ).
NB: I am not a Doctor and anything I say should not be taken as medical advice .... it's just my 2p worth.
Summary:
Basil = long acting insulin
Bolus = fast acting insulin
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Like your question asks you are seeing lots of people mention basil and if they mean the herb. As others have said do you mean basal?
Basil is indeed a herb but I haven’t seen it mentioned on the forum as helping with BG but there may be something in it as @Westley has found out. On the other hand basal is a slow acting insulin that those who are on a certain insulin regime use as a background insulin to keep their BG in acceptable range.
Both very different things but can be confusing amongst all the info to take in on the forum