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Here is nice data set and analysis - example analysis:
https://dietarysupplementdatabase.usda.nih.gov/ingredient_calculator/calc_omega3.php
In the US there is little regulation of the contents of dietary supplements. As a result NIH created a supplements database which has analysis results for groups of supplements. The idea is:
How much stuff do I have in this pill? And you get a 'more or less' kind of answer.
If you open the example page, click the 95%CI button. What you get is the expected value of some supplement as a confidence interval. The example is for omega3 fatty acids, In the example, if the label on your supplement says DHA 120mg, then you have a reasonably good chance (95%) that you have somewhere between 115 and 121 mg. Probably.
There are sets of screens, one for multivitamins (MVM), and others. All are very like the example in terms of design.
The MVM data is "interesting". Some mineral supplements have a huge CI, translation:
"Good luck on getting what you think you bought."
Other times things like mcg, IU, and so on are NOT the same thing, they vary by vitamin molecule, and it confuses people, mostly when it comes to vitamins A, D, E, K. ...for lots of reasons beyond the scope of this little message. Example for vitamin A:
https://ods.od.nih.gov/factsheets/VitaminA-HealthProfessional/
From the example link to the database you can click around the site and see what is available.
Again, this is US only. Some countries are very good on supplement labels, New Zealand. Others are worse than the US. India comes to mind.
Have fun.
https://dietarysupplementdatabase.usda.nih.gov/ingredient_calculator/calc_omega3.php
In the US there is little regulation of the contents of dietary supplements. As a result NIH created a supplements database which has analysis results for groups of supplements. The idea is:
How much stuff do I have in this pill? And you get a 'more or less' kind of answer.
If you open the example page, click the 95%CI button. What you get is the expected value of some supplement as a confidence interval. The example is for omega3 fatty acids, In the example, if the label on your supplement says DHA 120mg, then you have a reasonably good chance (95%) that you have somewhere between 115 and 121 mg. Probably.
There are sets of screens, one for multivitamins (MVM), and others. All are very like the example in terms of design.
The MVM data is "interesting". Some mineral supplements have a huge CI, translation:
"Good luck on getting what you think you bought."
Other times things like mcg, IU, and so on are NOT the same thing, they vary by vitamin molecule, and it confuses people, mostly when it comes to vitamins A, D, E, K. ...for lots of reasons beyond the scope of this little message. Example for vitamin A:
https://ods.od.nih.gov/factsheets/VitaminA-HealthProfessional/
From the example link to the database you can click around the site and see what is available.
Again, this is US only. Some countries are very good on supplement labels, New Zealand. Others are worse than the US. India comes to mind.
Have fun.