Alpha Lipoic Source (Spinacia oleracea): Benefits, Dosage, Safety & Evidence

Frequently asked questions

How does alpha lipoic acid work in the body?

Alpha lipoic acid functions as a unique 'universal' antioxidant because it is both fat and water soluble, allowing it to operate in all cellular compartments. ALA regenerates other antioxidants including vitamins C and E, and serves as a precursor for glutathione production. Additionally, ALA improves insulin sensitivity by enhancing glucose uptake in cells and supports mitochondrial energy metabolism. Evidence Level: C.

Can I take alpha lipoic acid with diabetes medications?

Alpha lipoic acid may interact with diabetes medications by enhancing their blood sugar-lowering effects. ALA can reduce blood glucose levels independently, potentially causing hypoglycemia when combined with insulin or oral antidiabetic drugs. Patients taking diabetes medications should monitor blood glucose closely and consult their healthcare provider before starting ALA supplements. Dosage adjustments may be necessary. Evidence Level: C.

What is the recommended daily dosage for alpha lipoic acid?

The typical adult dosage for alpha lipoic acid supplements ranges from 300-600 mg daily. Food sources such as spinach, broccoli, and organ meats contain only trace amounts of ALA, making supplements necessary for therapeutic doses. For best absorption, ALA should be taken on an empty stomach. Doses above 600 mg daily should only be used under medical supervision due to potential thiamine depletion. Evidence Level: C.

Is alpha lipoic acid safe during pregnancy and breastfeeding?

Alpha lipoic acid supplements are considered unsafe during pregnancy and should be avoided. There is insufficient safety evidence for use in pregnant or breastfeeding women, and potential risks to fetal development have not been adequately studied. Pregnant women should obtain antioxidants through whole food sources like spinach and broccoli rather than concentrated supplements. Consult a qualified healthcare provider before using any supplements during pregnancy. Evidence Level: C.

What foods are high in alpha lipoic acid?

Foods containing alpha lipoic acid include spinach, broccoli, Brussels sprouts, organ meats (particularly liver and kidney), and certain other vegetables. However, these food sources contain only small amounts of ALA—typically less than 1 mg per serving. To achieve therapeutic doses used in research studies (300-600 mg), supplementation is generally necessary. Including these foods as part of a balanced diet supports overall antioxidant status. Evidence Level: Traditional.

What are the side effects of alpha lipoic acid supplements?

Common side effects of alpha lipoic acid include gastrointestinal disturbances such as nausea, stomach upset, and diarrhea, particularly when taken on an empty stomach. Very high doses may cause thiamine (vitamin B1) deficiency over time. Some individuals experience skin rash or itching. ALA may also lower blood sugar, potentially causing hypoglycemia symptoms like dizziness or sweating. Side effects are generally mild and dose-dependent. Evidence Level: C.

PubMed-compiled information sheet

This sheet was compiled from PubMed (NIH) abstracts using AI assistance. Every factual claim is cited to a real PubMed article (see the source list). It has not yet been human-reviewed — confirm with a healthcare provider before use.

Compiled from 30 PubMed articles · model: gemma4:31b

Summary

Spinacia oleracea (spinach) is a nutrient-dense functional food containing various phytochemicals and bioactives that provide antioxidant and health-promoting activities [PMID:27353735].

Background

Spinacia oleracea L. is a widely cultivated, dioecious, diploid, wind-pollinated leafy green vegetable [PMID:38892313, PMID:37764187]. It is recognized as a functional food due to its diverse composition of vitamins, minerals, and bioactive compounds [PMID:27353735].

Traditional uses

In traditional Persian medicine, spinach is described as a nutrient-rich, laxative, and fast-digesting agent [PMID:38549540]. It is also reported in traditional medicine to treat more than one health problem [PMID:31161986].

Active compounds

Active components include flavones, flavanols, methylenedioxyflavonol glucuronides, carotenoids, and phenolic compounds [PMID:31161986, PMID:28082792]. Specific bioactives identified include 20-hydroxyecdysone (a phytoecdysteroid), rutin, and chlorophyll derivatives [PMID:39594114, PMID:31522557, PMID:37033738]. It also contains micronutrients such as calcium, folates, zinc, retinol, iron, ascorbic acid, and magnesium [PMID:37764187].

Mechanism of action

Spinach-derived bioactives scavenge reactive oxygen species to prevent macromolecular oxidative damage and modulate genes involved in inflammation, metabolism, proliferation, and antioxidant defense [PMID:27353735]. They may also induce the secretion of satiety hormones to curb food intake [PMID:27353735].

Clinical evidence

Evidence DMyocardial Infarction (Rat Model)

An antioxidant-rich extract (NAOE) attenuated elevated serum marker enzymes (AST, LDH, CPK), troponin I, total cholesterol, triglycerides, uric acid, CRP, TNF-α, IL-6, and malondialdehyde, while restoring ECG and systolic blood pressure [PMID:31522557].

Evidence DOsteoarthritis (Rat Model)

Spinacia oleracea extract (SOE) administered orally (125 and 250 mg/kg/day) improved joint morphology and preserved cartilage appearance [PMID:32901645].

Evidence DChronic Restraint Stress (Rat Model)

Hydroalcoholic extract of spinach (SHE) attenuated the hippocampal expression of TNF-α and IL-1β [PMID:32284934].

Evidence DAdvanced Glycation End Products (AGEs)

Baby spinach demonstrated high antiglycative activity in chemical and bread models, primarily through antioxidation [PMID:37033738].

Safety & adverse effects

Spinach contains anti-nutritional factors including alkaloids, phytates, saponins, oxalates, and tannins, which may hinder nutrient absorption [PMID:37764187]. Aqueous leaf extracts showed low cytotoxicity in hemolysis assays (8.1%) [PMID:41425863].

Evidence summary

The evidence consists primarily of in vitro studies, animal models (rats), and literature reviews. There are no human clinical trials provided in the abstracts.

PubMed sources

1.PMID: 27353735 (2016) — Functional properties of spinach (Spinacia oleracea L.) phytochemicals and bioactives. · Food & function
2.PMID: 38732627 (2024) — Ecdysterone and Turkesterone-Compounds with Prominent Potential in Sport and Healthy Nutrition. · Nutrients
3.PMID: 16659940 (1977) — Chloroplast glutathione reductase. · Plant physiology
4.PMID: 31522557 (2022) — Cardioprotective potential of Spinacia oleracea (Spinach) against isoproterenol-induced myocardial infarction in rats. · Archives of physiology and biochemistry
5.PMID: 38892313 (2024) — Gene Regulatory Network Controlling Flower Development in Spinach (Spinacia oleracea L.). · International journal of molecular sciences

Alpha Lipoic Source

Sources & Citations

Calculate a safe dose of Alpha Lipoic Source