Grandmas unsulphered molasses @ the market $4.
Blackstrap isn't a racist term

It refers to a reducing or refining thru more product boiling to crystallize sucrose.
It is loaded with Calcium , magnesium and iron. For us growers Its a soil additive to promote microbial activity
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Forget the high priced " bottle " supplements like BUD CANDY , extracts , etc.
This is a better and cheaper alternative that adds a sweet tone to the buds but NOT change the strains original taste profile. You can add molasses from start to finish on your grows or at every OTHER water or during mid to late flowering.