Vyvanse, which now has a generic but can still be pricey, is a “pro-drug” that your body metabolizes and turns into dextroamphetamine.

I’ve found that dextroamphetamine worked much better for me than normal amphetamine salts. Adderall was very helpful for me and has a mix of the dextro and the normal, but 100% sec was better.

But furthermore, the vyvanse has a nice gradual onset and offset and allowed me to get a strong dose through the middle of the day without the crash of being super irritable that I’d get as adderall wore off.

Makes sense to me that they could theoretically work all the way down to near 0 kelvin, just depends on their efficiency. Just so long as there is heat to be had…

Also, not sure energy star really means much.