Nootropics · Guide
Pantogam (Hopantenic Acid): Sharpen and Settle at Once
Vitamin B5 bonded to GABA. It modulates calming tone rather than flooding it, which is why the effect is clarity with a mild floor, not sedation.
Razumna editorial · 6 min read · Updated June 2026
The short answer
Pantogam is hopantenic acid, vitamin B5 chemically bonded to GABA. The pairing lets the molecule act centrally, where plain oral GABA largely cannot, and it modulates GABAergic signaling rather than flooding it. The result is a measured calm-plus-clarity rather than sedation. It builds over a course, dosed 2 to 3 times a day, and pairs cleanly under a daytime stimulant.
How it works
Hopantenic acid is vitamin B5 bonded to GABA, the brain's primary calming neurotransmitter. The pantothenic-acid backbone lets the molecule act centrally and modulate GABAergic tone instead of flooding a receptor. In rat cortex tissue the D-form alters GABA uptake at very low concentrations (PMID 3191967), which is the proposed basis for the calm-with-clarity profile rather than dullness. Peak plasma is near 1.6 hours, the half-life is around 6.7 hours, and it clears unchanged within 48 hours.
Dosing and timing
The standard adult range is 250 to 500mg per dose, typically 2 to 3 times daily, titrated to effect. Start at the low end and assess; the pack is 50 tablets at 250mg. Take it in the first and middle parts of the day, because the mild activating component can disrupt sleep if dosed late. Effects build over a course rather than landing acutely from a single dose.
Stacking
It pairs logically with a daytime stimulant such as modafinil, where the GABAergic floor offsets the stimulant edge, and it stacks cleanly with choline sources. Go cautious combining it with other GABAergic agents or sedatives, since that combination is not well characterized. Note this is the standard racemic hopantenic acid, not the separate Pantogam Active formulation.
The honest limits
The clinical evidence base is largely Soviet and Russian patient-population data (Smulevich, 2015), not robust placebo-controlled trials in healthy nootropic users, so efficacy should not be overstated. It is sourced through a licensed CIS pharmacy network as a research and personal-use compound, not approved Western medicine. This is information, not medical advice.
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Common questions
How is this different from plain GABA?
Oral GABA struggles to act centrally. Hopantenic acid bonds GABA to vitamin B5, which lets the molecule work in the brain and modulate GABAergic tone rather than simply flooding a receptor, producing calm-plus-clarity instead of nothing.
Is it sedating?
No. The mild activating component means it leans toward clarity with a calm floor. Dosed late it can disrupt sleep, which is why it is a daytime compound.
Can I stack it with modafinil?
That is a common pairing. The GABAergic floor offsets the stimulant edge. It also stacks cleanly with choline.
Sources
- Hopantenic acid (calcium homopantothenate) (Wikipedia)
- Effect of pantothenate and homopantothenate on GABA uptake in rat cortex (PMID 3191967)
- Hopantenic acid in cognitive and anxiety disorders, Smulevich 2015 (PMID 26978493)
This article is information, not medical advice. Razumna does not name compounds as treatments for any condition.
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