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Astragalus
Astragalus has 2,000+ years of use in Traditional Chinese Medicine as huang qi, a "qi tonic" given for fatigue, weakness, and to support what TCM calls wei qi (defensive energy, roughly mapped onto immune function).
- Evidence
- Weak Evidence
- Category
- Immune Support
- Best form
- Whole root powder (E. membranaceus dried root, the form used in most TCM decoctions and the closest match to traditional preparations)
- Effective dose
- 500-1,500mg/day of dried astragalus root powder in capsules
- Lab tested
- 4 of 8 products
- Category
- Immune Support
- Best form
- Whole root powder (E. membranaceus dried root, the form used in most TCM decoctions and the closest match to traditional preparations)
- Effective dose
- 500-1,500mg/day of dried astragalus root powder in capsules
- Lab tested
- 4 of 8 products
Key takeaways
- →Most positive astragalus trials are chemotherapy, diabetes, or kidney-disease adjunct studies in Chinese populations using formulas or injections, not the single-herb capsules sold in US stores.
- →TA-65 (cycloastragenol) is a separate ecosystem: $400-600/year mail-order through TA Sciences, with one industry-funded RCT showing telomere effects; standard consumer astragalus products do not contain it.
- →Generally well-tolerated long-term, but skip if you have an autoimmune condition, take immunosuppressants, or are pregnant - it is an immunostimulant.
- →Reasonable if you are drawn to traditional tonic herbs; do not expect dramatic cold prevention, energy, or anti-aging effects from a 500mg capsule.
What Is Astragalus?
Astragalus has 2,000+ years of use in Traditional Chinese Medicine as huang qi, a "qi tonic" given for fatigue, weakness, and to support what TCM calls wei qi (defensive energy, roughly mapped onto immune function). It is the most-used herb in Chinese formulas for chronic illness and post-illness recovery. That long tradition is meaningful for safety. It is not meaningful for the kind of efficacy data Western readers usually want.
The modern human RCT base on astragalus is thin and methodologically uneven. The strongest published signal is McCulloch's 2006 meta-analysis in the Journal of Clinical Oncology, which pooled 34 randomized trials of astragalus-based Chinese herbal formulas given alongside platinum-based chemotherapy in advanced non-small-cell lung cancer. Adding astragalus to chemotherapy was associated with reduced 12-month mortality and improved tumor response. McCulloch's team was careful to flag that almost all included trials were Chinese-language, used variable astragalus formulas (rarely single-herb), and had high risk of publication bias. That meta-analysis remains the most-cited piece of astragalus evidence and is also the most-caveated. A 2024 Hong et al. systematic review reached a similar split conclusion for astragalus as an adjuvant in type 2 diabetes: pooled benefit on fasting glucose and HbA1c, but predominantly Chinese-language trials with quality concerns.
The Zhang 2014 Cochrane review of astragalus in chronic kidney disease pooled 22 RCTs (n=1,323) of astragalus injection or oral formulas added to conventional CKD care. It found possible reductions in proteinuria and improvements in hemoglobin, but the authors concluded the evidence was low-quality and could not support routine clinical use. Fu's 2011 PLoS One review of huangqi (astragalus) injection in chronic heart failure was similarly mixed-positive but constrained to low-quality Chinese trials of an injectable form not sold to US consumers.
The longevity story is a separate ecosystem. Cycloastragenol, a saponin isolated from astragalus, is the active compound in TA-65, sold by TA Sciences as a telomerase activator. The Salvador 2016 RCT in Rejuvenation Research randomized 117 healthy adults aged 53-87 to TA-65 or placebo and reported significant lengthening of the shortest telomeres at one year - a real and unusual finding. It is also industry-funded, used a proprietary extract that costs roughly $400-600/year through TA Sciences mail-order, and has not been independently replicated at the same dose with the same product. Importantly, almost no consumer astragalus supplement on Amazon or in retail contains TA-65 or anything close to it. Marketing copy that implies "astragalus supports telomeres" is borrowing the Salvador result and applying it to products that have nothing to do with the form tested.
What that adds up to: astragalus is a reasonable thing to try if you are drawn to TCM-aligned daily tonics and want a generally well-tolerated immune-support herb with a long traditional safety record. Do not expect it to dramatically prevent or shorten colds, do not expect it to extend telomeres, and do not expect a 500mg capsule of dried root to do what a Chinese decoction or a TA-65 dose would do. The evidence supports cautious traditional use, not the bigger marketing claims.
Does It Work? The Evidence
How A-F grades workQuality of life and survival as an adjuvant to platinum chemotherapy in advanced NSCLC
McCulloch et al. 2006 J Clin Oncol meta-analysis (PMID 16421421): 34 RCTs of astragalus-based Chinese herbal formulas with platinum chemo in advanced NSCLC, reduced risk of death at 12 and 24 months; authors flag high risk of publication bias and predominantly Chinese-language trials
Adjunct glycemic control in type 2 diabetes
Tian et al. 2016 J Ethnopharmacol meta-analysis (PMID 27269392): preliminary pooled benefit on fasting glucose and HbA1c; Hong et al. 2024 J Integr Complement Med (PMID 37433206): updated review concluded astragalus may improve glycemic markers as adjuvant but quality of included trials is low
Proteinuria reduction and hemoglobin in chronic kidney disease
Zhang et al. 2014 Cochrane Database Syst Rev (PMID 25335553): 22 RCTs, n=1,323; possible reductions in proteinuria and improved hemoglobin alongside conventional care, but low-quality evidence and not sufficient to support routine use
Symptom relief and ejection fraction in chronic heart failure (huangqi injection)
Fu et al. 2011 PLoS One systematic review (PMID 21573109): pooled trials of injectable huangqi (not sold to US consumers) added to conventional CHF therapy reported improvements in NYHA class and LVEF, but most trials were small Chinese-language and high risk of bias
Telomere length and immunosenescence (TA-65 / cycloastragenol)
Salvador et al. 2016 Rejuvenation Res (PMID 26950204): 117 adults 53-87 randomized to TA-65 vs placebo for 12 months; significant lengthening of shortest telomeres, no overall mean telomere change; industry-funded, proprietary purified extract, not replicated independently
Cold/URI prevention or duration in healthy adults
No well-powered placebo-controlled RCT of stand-alone astragalus in healthy adults for cold or URI endpoints; traditional immune-tonic claims rely on TCM use, not modern Western RCT data
Stand-alone fatigue, energy, or 'qi tonic' effects in healthy adults
No replicated placebo-controlled RCTs of single-herb astragalus for fatigue or vitality endpoints in otherwise-healthy adults; the traditional use is well-established but not separately validated in modern trials
| Grade | Claimed Benefit | Key Studies | Our Verdict |
|---|---|---|---|
| B | Quality of life and survival as an adjuvant to platinum chemotherapy in advanced NSCLC | McCulloch et al. 2006 J Clin Oncol meta-analysis (PMID 16421421): 34 RCTs of astragalus-based Chinese herbal formulas with platinum chemo in advanced NSCLC, reduced risk of death at 12 and 24 months; authors flag high risk of publication bias and predominantly Chinese-language trials | Early Signal |
| C | Adjunct glycemic control in type 2 diabetes | Tian et al. 2016 J Ethnopharmacol meta-analysis (PMID 27269392): preliminary pooled benefit on fasting glucose and HbA1c; Hong et al. 2024 J Integr Complement Med (PMID 37433206): updated review concluded astragalus may improve glycemic markers as adjuvant but quality of included trials is low | Early Signal |
| C | Proteinuria reduction and hemoglobin in chronic kidney disease | Zhang et al. 2014 Cochrane Database Syst Rev (PMID 25335553): 22 RCTs, n=1,323; possible reductions in proteinuria and improved hemoglobin alongside conventional care, but low-quality evidence and not sufficient to support routine use | Conflicted |
| C | Symptom relief and ejection fraction in chronic heart failure (huangqi injection) | Fu et al. 2011 PLoS One systematic review (PMID 21573109): pooled trials of injectable huangqi (not sold to US consumers) added to conventional CHF therapy reported improvements in NYHA class and LVEF, but most trials were small Chinese-language and high risk of bias | Not There Yet |
| C | Telomere length and immunosenescence (TA-65 / cycloastragenol) | Salvador et al. 2016 Rejuvenation Res (PMID 26950204): 117 adults 53-87 randomized to TA-65 vs placebo for 12 months; significant lengthening of shortest telomeres, no overall mean telomere change; industry-funded, proprietary purified extract, not replicated independently | Early Signal |
| F | Cold/URI prevention or duration in healthy adults | No well-powered placebo-controlled RCT of stand-alone astragalus in healthy adults for cold or URI endpoints; traditional immune-tonic claims rely on TCM use, not modern Western RCT data | Not There Yet |
| F | Stand-alone fatigue, energy, or 'qi tonic' effects in healthy adults | No replicated placebo-controlled RCTs of single-herb astragalus for fatigue or vitality endpoints in otherwise-healthy adults; the traditional use is well-established but not separately validated in modern trials | Not There Yet |
How to Choose: Forms, Doses & What Matters
Clinical dose: 500-1,500mg/day of dried astragalus root powder in capsules; 250-500mg/day of standardized extract; chemotherapy and chronic-kidney-disease adjunct trials used Chinese decoctions or injections at variable concentrations not directly comparable to US capsules
Best forms: Whole root powder (E. membranaceus dried root, the form used in most TCM decoctions and the closest match to traditional preparations), Standardized root extract (typically 0.5% astragalosides or 16% polysaccharides; varies widely by brand), Alcohol-based liquid tincture / extract (Herb Pharm style, 1:5 herb-to-extract ratio), TA-65 / cycloastragenol (proprietary purified telomerase-activator extract from TA Sciences; sold only mail-order, not in mainstream consumer astragalus products)
For a daily traditional tonic, 500-1,500mg/day of dried root powder in divided doses with food is the most common range. Standardized extracts (0.5% astragalosides or 16% polysaccharides) typically dose at 250-500mg once or twice daily per label. Liquid tinctures dose by dropper count - follow the bottle, since 1:5 and 1:2 extracts are not directly comparable to capsule milligrams. Chinese decoctions in TCM practice run higher (9-30g of raw herb simmered into a tea), but that is a different category of product and not what is in a US capsule. Take consistently for at least 4-8 weeks before judging effect; this is a tonic herb, not an acute remedy. TA-65 is dosed per the TA Sciences protocol and is a separate product class.
Who Should Take Astragalus?
Adults interested in TCM-aligned daily tonic herbs who want a well-tolerated immune-support botanical with a long traditional safety record. People undergoing platinum-based chemotherapy who want to discuss astragalus-based adjunct formulas with an integrative oncologist (under physician supervision, not as self-medication). Adults with chronic kidney disease who want to ask their nephrologist about astragalus as a possible adjunct to conventional care. Older adults curious about TA-65 / cycloastragenol who can afford the $400-600/year proprietary product and understand the evidence is one industry-funded trial.
Who Should Avoid It?
Not for everyone
Side Effects & Safety
Product Scores
8 products scored on dosing accuracy, third-party testing, cost per effective dose, and label transparency.
The Scorecard: 8 Products Compared
Astragalus 250mg, 60ct
Pure Encapsulations$22.00 ÷ 59 days at 250mg/day (1 serving × 250mg)
The clinician-channel pick; pay for the hypoallergenic formulation and the testing program if those matter to you
Prices checked 2026-05-17. Cost shown is per clinically effective daily dose, not per pill.
Astragalus Root Standardized 500mg, 60ct
Nature's Way
$13.99 ÷ 61 days at 500mg/day (1 serving × 500mg)
One of the few mainstream SKUs that discloses a marker-compound spec; if you want a hybrid whole-root plus standardized extract, this is the cleanest option
Prices checked 2026-05-18. Cost shown is per clinically effective daily dose, not per pill.
Astragalus Liquid Extract 1oz
Herb Pharm
$14.99 ÷ 30 days at 60drops/day (2 servings × 30drops)
The traditional herbalist's pick; format matches how astragalus is often used in Western clinical herbalism
Prices checked 2026-05-18. Cost shown is per clinically effective daily dose, not per pill.
Astragalus 500mg, 100ct
NOW Foods$11.99 ÷ 100 days at 500mg/day (1 serving × 500mg)
Workhorse pick if you want to try astragalus cheaply with a reputable manufacturer; whole-root format is the closest commercial match to traditional preparations
Prices checked 2026-05-18. Cost shown is per clinically effective daily dose, not per pill.
Astragalus Root Liquid Phyto-Caps, 60ct
Gaia Herbs$24.99 ÷ 60 days at 700mg/day (1 serving × 700mg)
The traceability story is the differentiator; pay for it if batch-level transparency matters to you
Prices checked 2026-05-17. Cost shown is per clinically effective daily dose, not per pill.
Full Spectrum Astragalus Extract 500mg, 120ct
Planetary Herbals
$17.99 ÷ 120 days at 500mg/day (1 serving × 500mg)
Reasonable pick for buyers who like the Planetary Herbals herbalist provenance and want a long-supply bottle at a moderate price
Prices checked 2026-05-18. Cost shown is per clinically effective daily dose, not per pill.
Astragalus Extract 500mg, 120ct
Source Naturals
$18.99 ÷ 119 days at 500mg/day (1 serving × 500mg)
Interchangeable with Planetary Herbals at similar price and quality tier; pick by which brand you already buy from
Prices checked 2026-05-17. Cost shown is per clinically effective daily dose, not per pill.
Astragalus Root 400mg, 100ct
Solaray
$12.99 ÷ 33 days at 1200mg/day (3 servings × 400mg)
Solid mid-tier whole-root option from an established US herbal brand; format is fine, dosing per cap is on the low side
Prices checked 2026-05-18. Cost shown is per clinically effective daily dose, not per pill.
Full Comparison
| Category | Astragalus 250mg, 60ct Pure Encapsulations | Astragalus Root Standardized 500mg, 60ct Nature's Way | Astragalus Liquid Extract 1oz Herb Pharm | Astragalus 500mg, 100ct NOW Foods | Astragalus Root Liquid Phyto-Caps, 60ct Gaia Herbs | Full Spectrum Astragalus Extract 500mg, 120ct Planetary Herbals | Astragalus Extract 500mg, 120ct Source Naturals | Astragalus Root 400mg, 100ct Solaray |
|---|---|---|---|---|---|---|---|---|
| Brand Score | 82/100Winner | 80/100 | 79/100 | 78/100 | 78/100 | 74/100 | 73/100 | 72/100 |
| Dosing & Form | 19/25 | 22/25Winner | 19/25 | 19/25 | 19/25 | 19/25 | 19/25 | 16/25 |
| Purity | 22/25Winner | 19/25 | 19/25 | 19/25 | 19/25 | 16/25 | 16/25 | 19/25 |
| Value | 18/25 | 17/25 | 18/25 | 22/25Winner | 17/25 | 21/25 | 20/25 | 19/25 |
| Transparency | 23/25Winner | 22/25 | 23/25 | 18/25 | 23/25 | 18/25 | 18/25 | 18/25 |
| Cost/Day | $0.37 | $0.23 | $0.50 | $0.12Winner | $0.42 | $0.15 | $0.16 | $0.39 |
| Dose/Serving | 250mg | 500mg | 30drops | 500mg | 700mg | 500mg | 500mg | 400mg |
| Form | Astragalus membranaceus root extract (vegetarian capsules) | Astragalus root + standardized extract (vegan capsules) | Astragalus membranaceus root liquid extract (1:5 in organic cane alcohol) | Dried Astragalus membranaceus root powder (vegan capsules) | Liquid Astragalus root extract in vegan capsules | Astragalus membranaceus root + extract blend (tablets) | Astragalus membranaceus root extract (tablets) | Dried Astragalus membranaceus root powder (vegan capsules) |
| Third-Party Tested | ✓ Yes | ✓ Yes | ✓ Yes | No | ✓ Yes | No | No | No |
| Proprietary Blend | No | No | No | No | No | No | No | No |
Frequently Asked Questions
Is astragalus the same thing as TA-65?
No. TA-65 is a proprietary purified extract of cycloastragenol, a specific saponin from astragalus root, sold mail-order through TA Sciences at roughly $400-600 per year. The Salvador 2016 RCT that showed telomere-length effects used TA-65 specifically. A standard 500mg astragalus capsule from NOW or Nature's Way contains whole or extracted root with tiny amounts of cycloastragenol naturally present, nothing like the concentration in TA-65. Marketing that implies a regular astragalus supplement will deliver TA-65-style effects is borrowing the Salvador headline without delivering the product.
Does astragalus prevent colds?
There is no good placebo-controlled RCT in healthy adults showing astragalus prevents or shortens colds. Most positive trials are in chemotherapy or kidney disease patients using Chinese herbal formulas, not single-herb capsules for cold prevention. If you want a botanical with actual cold-prevention RCT data, Echinaforce (fresh-pressed E. purpurea) has the cleanest evidence. Astragalus is reasonable as a traditional tonic, but not on the basis of cold-prevention trials.
Whole root powder vs standardized extract vs tincture - what should I pick?
Whole dried root powder in capsules (500-1,000mg) is the closest match to traditional TCM use and has the longest empirical safety record. Standardized extracts (typically 0.5% astragalosides or 16% polysaccharides) concentrate specific markers but rarely have head-to-head trials proving they outperform whole root for a given endpoint. Alcohol tinctures (1:5 Herb Pharm style) are dosed by dropper and are popular with herbalists for absorption and flexibility. None of these forms have been definitively shown superior to the others in modern human trials. Pick by preference and price.
Should I take astragalus during chemotherapy?
Only with your oncologist's explicit approval. The McCulloch 2006 meta-analysis is the source of most chemo-adjunct claims, and it pooled Chinese-language trials of multi-herb formulas administered under TCM supervision, not solo astragalus capsules from a US retailer. There are also theoretical concerns about herb-drug interactions and about immunostimulants during certain regimens. If you are interested, ask your oncology team - especially an integrative oncologist - rather than self-supplementing.
Is astragalus safe with autoimmune conditions?
Probably not advised. Astragalus is classed as an immunostimulant in most modern reference texts, meaning it nudges immune activity up rather than down. For autoimmune conditions where the problem is an already-overactive immune response (lupus, MS, rheumatoid arthritis, psoriasis, Hashimoto's), the theoretical effect runs the wrong direction. There are no large RCTs specifically testing safety in autoimmune disease, so the cautious default is to avoid it.
How long until I notice anything?
Astragalus is a traditional tonic herb, not an acute remedy. TCM use is typically continuous for months. If you are going to give it a real chance, plan for 4-8 weeks minimum at a steady dose. If you feel nothing at 8 weeks of 1,000mg/day, it is unlikely to do much for you. Acute symptom-onset dosing (the way some people use echinacea or elderberry at the first sign of a cold) is not how astragalus is traditionally used.
Can astragalus interact with my medications?
A few interactions to flag. Lithium: case reports suggest astragalus may reduce renal clearance and raise lithium levels. Immunosuppressants (cyclosporine, tacrolimus, mycophenolate): astragalus is an immunostimulant and could theoretically blunt their effect; transplant patients should avoid it. Antihypertensives and antidiabetic drugs: astragalus has mild blood-pressure-lowering and glucose-lowering signals in some trials, so monitor if you are stacking. Anticoagulants: limited evidence either way. As always, run it past your prescriber if you take any chronic medication.
Related Reading
Sources
- McCulloch M, See C, Shu XJ, et al. Astragalus-based Chinese herbs and platinum-based chemotherapy for advanced non-small-cell lung cancer: meta-analysis of randomized trials. J Clin Oncol. 2006;24(3):419-430.
- Salvador L, Singaravelu G, Harley CB, et al. A Natural Product Telomerase Activator Lengthens Telomeres in Humans: A Randomized, Double Blind, and Placebo Controlled Study. Rejuvenation Res. 2016;19(6):478-484.
- Zhang HW, Lin ZX, Xu C, Leung C, Chan LS. Astragalus (a traditional Chinese medicine) for treating chronic kidney disease. Cochrane Database Syst Rev. 2014;(10):CD008369.
- Tian H, Lu J, He H, et al. The effect of Astragalus as adjuvant treatment in type 2 diabetes mellitus: A (preliminary) meta-analysis. J Ethnopharmacol. 2016;191:206-215.
- Hong KF, Liu PY, Zhang W, et al. The Efficacy and Safety of Astragalus as an Adjuvant Treatment for Type 2 Diabetes Mellitus: A Systematic Review and Meta-Analysis. J Integr Complement Med. 2024;30(1):11-24.
- Fu S, Zhang J, Menniti-Ippolito F, et al. Huangqi injection (a traditional Chinese patent medicine) for chronic heart failure: a systematic review. PLoS One. 2011;6(5):e19604.
- Zhu J, Lee S, Ho MK, et al. In vitro intestinal absorption and first-pass intestinal and hepatic metabolism of cycloastragenol, a potent small molecule telomerase activator. Drug Metab Pharmacokinet. 2010;25(5):477-486.
- Shen CY, Jiang JG, Yang L, Wang DW, Zhu W. Anti-ageing active ingredients from herbs and nutraceuticals used in traditional Chinese medicine: pharmacological mechanisms and implications for drug discovery. Br J Pharmacol. 2017;174(11):1395-1425.
- NIH National Center for Complementary and Integrative Health. Astragalus - Information for Consumers.
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