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Research analysis lead by Kamal Patel
All content reviewed by Examine.com Team. Published:
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Summary of Hemoglobin

Primary Information, Benefits, Effects, and Important Facts

Scientific Information on Hemoglobin

Human Effect Matrix

The Human Effect Matrix looks at human studies (it excludes animal and in vitro studies) to tell you what supplements affect hemoglobin
Grade Level of Evidence
Robust research conducted with repeated double-blind clinical trials
Multiple studies where at least two are double-blind and placebo controlled
Single double-blind study or multiple cohort studies
Uncontrolled or observational studies only
Level of Evidence
? The amount of high quality evidence. The more evidence, the more we can trust the results.
Outcome Magnitude of effect
? The direction and size of the supplement's impact on each outcome. Some supplements can have an increasing effect, others have a decreasing effect, and others have no effect.
Consistency of research results
? Scientific research does not always agree. HIGH or VERY HIGH means that most of the scientific research agrees.
grade-b L-Carnitine - - See study
grade-c Ashwagandha Minor - See study
A slight but significant 6.3% increase in hemoglobin has been detected in otherwise healthy persons given ashwagandha daily for a period of 60 days.
grade-c Saffron Minor - See study
Hemoglobin has been noted to be decreased in one study and thought to be related to possible toxic effects of moderately high dose saffron (60mg for more than 8 weeks).
grade-c Colostrum  
grade-c Lactobacillus reuteri  
grade-c Vitamin E  
grade-d Vitamin D  

All comparative evidence is now gathered in our ​A-to-Z Supplement Reference.

The evidence for each separate supplement is still freely available ​here.