Why Herbal Supplements Dosage Is Harder to Pin Down
Unlike synthetic nutrients with precise molecular weights, herbal supplements dosage depends on the part of the plant used (root, leaf, seed), the extraction method, the active constituent concentration, and the standardisation approach. A product labelled "500 mg ashwagandha" may deliver very different amounts of the active withanolides depending on whether it uses a raw powder or a KSM-66 extract standardised to 5% withanolides. Understanding this context is essential before applying any dose figure.
At maxfit.ee, well-characterised adaptogen products are available, including ICONFIT Capsules Ashwagandha N90, OstroVit KSM-66 Ashwagandha VEGE 120caps, and OstroVit Turmeric + Black pepper + Ginger 90tabs.
Ashwagandha (Withania somnifera)
Ashwagandha is among the most researched adaptogens. The strongest evidence comes from studies using KSM-66 or Sensoril extracts. Chandrasekhar et al. (2012) conducted a double-blind, randomised, placebo-controlled trial showing that a dose of 300 mg KSM-66 extract twice daily (600 mg/day total) significantly reduced serum cortisol and self-reported stress scores over 60 days. This is the dose range most consistently backed by RCT evidence: 300–600 mg/day of standardised root extract.
Curcumin (Turmeric)
Curcumin is the principal active polyphenol in turmeric. Its major challenge is poor oral bioavailability. Standard curcumin powder has very low bioavailability; enhanced formulations (phospholipid complexes, nanoparticles, or combined with piperine) are significantly more bioavailable. Aggarwal & Harikumar (2009) reviewed mechanisms and human data, noting most clinical trials have used 1000–1500 mg/day of curcumin extract (not raw turmeric), with bioavailability enhancement critical to achieving measurable tissue levels. Raw turmeric powder is not an effective substitute at supplemental doses.
Ginkgo Biloba
Ginkgo biloba extract (standardised to 24% flavone glycosides and 6% terpene lactones) is studied most extensively for cognitive function in ageing populations. The canonical dose used in most published trials is 120–240 mg/day of standardised extract, divided into two or three doses with meals. Below 120 mg/day, most efficacy trials have not shown reliable benefit.
Dose by Goal
| Herb | Goal | Dose (Standardised Extract) | Evidence Level |
|---|---|---|---|
| Ashwagandha (KSM-66) | Stress / cortisol | 300–600 mg/day | RCTs available |
| Curcumin (enhanced) | Inflammation / joints | 500–1500 mg/day | RCTs available |
| Ginkgo biloba | Cognitive function | 120–240 mg/day | RCTs available |
| Ginseng (Panax) | Energy / mental performance | 200–400 mg/day | RCTs available |
Timing Considerations
Ashwagandha is best taken with a small meal; twice-daily dosing (morning and evening) aligns with most successful RCTs. Curcumin should always be taken with a fat-containing meal and, if using a piperine-combination formula, this typically applies to the entire dose. Ginkgo is usually split across meals to reduce the low risk of GI discomfort at higher doses.
Upper Limits and Safety
Ashwagandha is generally safe up to 600 mg/day of standardised extract in studies lasting 8–12 weeks. Rare cases of liver injury have been reported with very high doses; stay within studied ranges. Curcumin at supplemental doses is well tolerated in short trials; very high doses (above 8 g/day) cause GI effects. Ginkgo may increase bleeding risk in combination with anticoagulants; avoid before surgery. Always look for standardised extracts rather than raw herb powders for dose predictability.
FAQ
Does the whole herb work the same as an extract?
Generally, no. Many herbal supplements studies use standardised extracts that concentrate specific active compounds. Raw herb powders deliver unpredictable amounts of these compounds and often at lower concentrations. For dose comparability, always check whether a product uses a named, standardised extract.
How long do herbal supplements take to work?
Adaptogens like ashwagandha typically require 4–8 weeks of consistent use for stress and cortisol outcomes. Curcumin effects on joint discomfort in trials appear after 6–12 weeks. Acute effects (like ginseng's mental performance lift) can occur within hours of a dose in some studies.
Can I take multiple herbal supplements together?
In many cases yes, but interactions are possible. Ginkgo and ginseng together may amplify mild antiplatelet effects; combining multiple adaptogens hasn't been extensively studied. If you take any prescription medications, review potential interactions with a healthcare provider.
References
Chandrasekhar, K., Kapoor, J., & Anishetty, S. (2012). A prospective, randomized double-blind, placebo-controlled study of safety and efficacy of a high-concentration full-spectrum extract of Ashwagandha root in reducing stress and anxiety in adults. Indian Journal of Psychological Medicine, 34(3), 255–262. https://pubmed.ncbi.nlm.nih.gov/23439798/
Aggarwal, B. B., & Harikumar, K. B. (2009). Potential therapeutic effects of curcumin, the anti-inflammatory agent, against neurodegenerative, cardiovascular, pulmonary, metabolic, autoimmune and neoplastic diseases. International Journal of Biochemistry & Cell Biology, 41(1), 40–59. https://pubmed.ncbi.nlm.nih.gov/18662800/
DeKosky, S. T., Williamson, J. D., Fitzpatrick, A. L., Kronmal, R. A., Ives, D. G., Saxton, J. A., Lopez, O. L., Burke, G., Carlson, M. C., Fried, L. P., Kuller, L. H., Robbins, J. A., Tracy, R. P., Woolard, N. F., Dunn, L., Snitz, B. E., Nahin, R. L., & Furberg, C. D. (2008). Ginkgo biloba for prevention of dementia: a randomized controlled trial. JAMA, 300(19), 2253–2262. https://pubmed.ncbi.nlm.nih.gov/19017911/
