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Instead, you risk wasting a good supplement

Suboptimal intakes or deficiencies of vitamins, minerals and fatty acids can be assessed through dietary recall and/or laboratory testing, although both have limitations and may not accurately identify treatment responders, and nutrients may have pharmacological effects independent of deficiency or low dietary intake

so, you can make an informed choice

Supplements can be useful to ensure you get enough nutrients, but they are not necessary

For example, in plasma and tissue samples, samples are usually derivatized by dissolving in methanol and adding internal standards to improve the sensitivity and stability of the detection