antioxidant · for brain fog
ALA
Reaches the brain and is meant to cut oxidative stress and improve how neurons use glucose.
Say that in clinical terms
Crosses BBB, reduces oxidative stress in neurons, improves cerebral glucose metabolism.
How strong is the research?
A small unblinded study of 15 people, average age 84, found no effect on memory, thinking or mood.
2 papers read, 1 against.
Who was studied: Every human trial is in Alzheimer’s or mild cognitive impairment. Nobody has tested everyday mental fog.
How much to take
daily
300–600 mg
Crosses blood-brain barrier. May improve cognitive function in metabolic impairment.
Before you take it
- Hypoglycemia risk: ALA increases insulin sensitivity; co-administration with insulin or oral hypoglycemic agents (sulfonylureas, meglitinides) can produce clinically significant additive blood glucose reductions requiring monitoring.
- Biotin competition: ALA and biotin share cellular uptake via monocarboxylate transporters; sustained supplementation at doses ≥600 mg/day may reduce biotin bioavailability.
- No NIH/IOM Tolerable Upper Intake Level has been established for alpha-lipoic acid. A 2020 safety meta-analysis (Zembron-Lacny et al., PMC7603186; 4,749 subjects across placebo-controlled RCTs) found no increased risk of treatment-emergent adverse events vs. placebo across the studied dose range of 100–2,400 mg/day.
- Pregnancy and lactation: human safety data are insufficient; most authorities do not recommend routine ALA supplementation in these populations pending further study.
- Most commonly reported adverse effects are gastrointestinal (nausea, heartburn, bloating), occurring predominantly at doses ≥600 mg/day.
What we make of it
The source is a biochemistry review with no people in it at all.
The detail
What we cite is a review of the chemistry, not a study of anyone. It has no participants and no sample size. The claims about reaching the brain and improving how neurons use glucose come from animal and cell work summarised in that review.