Anyone know for any brand that does this? I want sugar free because I'm starting low carb diet and would like to use It on days I feel I'm struggling with energy levels.
The main ingredient of readily available carb-free pre-workouts likely to give your energy levels a boost is caffeine, so the cheapest option is a strong black coffee.
If you buy anything that is "sugar free" it has artificial sweeteners in it like aspartame and acesulfame K which massively spike your insulin levels, much more than natural sugar does.
Sucralose is probably the most common sweetener used now and this doesn't spike insulin.
(Whether or not someone should worry about spiking insulin or not is different question, and the amino acids present in the drinks may well stimulate insulin release anyway - whey certainly does.)
Caffeine, tyrosine, beta alanine and citruline malate
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