Why stacking supplements without a blood test first can do more harm than good

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Stabile, A. (2026, October 21). Why stacking supplements without a blood test first can do more harm than good. Fox News. https://www.foxnews.com/health/why-stacking-supplements-without-blood-test-first-can-do-more-harm-than-good

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Fox News · collected 2026-10-21 · by Angelica Stabile

Quick Summary

Clinical pharmacist Jim LaValle warns that taking multiple supplements without a proper blood test can be harmful. He advises individuals to identify specific deficiencies before supplementing, rather than assuming more is better or following social media trends. For instance, low iron and ferritin levels are often mistaken for needing energy-boosting herbs like ashwagandha instead of addressing the actual deficiency through testing and targeted supplementation.
Written locally by qwen2.5:14b on 2026-10-21, using this article's own text rather than the other coverage of the same event (that is the story summary below).

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Story summary

Jim LaValle, a clinical pharmacist and metabolic medicine expert based in Texas, warned on Fox News Digital about the risks of overusing nutritional supplements without proper medical guidance. Common supplements like zinc for immune function, ashwaganda for stress relief, fish oil for heart health, and magnesium for sleep have become popular but can be harmful if taken excessively or improperly combined with other medications.

LaValle emphasized that while he has "never met a supplement I didn't like under the right circumstances," taking multiple supplements without individualized assessment is problematic. He noted that low magnesium levels are linked to metabolic syndrome, and thus adding magnesium could be beneficial in such cases but only after proper evaluation.

The expert advised against stacking various supplements and peptides without understanding their interactions and potential impacts on overall health. This highlights the importance of consulting healthcare professionals before starting any supplement regimen.

Written for “Blood Tests And Supplements” on 2026-10-21, grounded in this article and the 0 other(s) covering the same event.
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📰 Blood Tests And Supplements
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Claims extracted
29
sentences that state something as happening or true
Uncertain
24%
7 of 29 hedged ("reportedly", "may", "according to")
Leaning
not political
takes no side on a contested political question
Publisher signals
67/100
Fox News's corrections and hedging, across everything collected from it. Not a measure of accuracy.
Outlets on this story
1
Health
Same framing elsewhere
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Fox News · 4913 article(s) · 9 correction(s) detected
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Who wrote this

Angelica Stabile
12 article(s) here · 1 carrying a prediction
🔮 In that case, he said, taking a magnesium supplement could help to balance out levels.
🔮 "I'm hoping that within four or five years, a screening CT scan will only be confirmatory after they have a positive blood test done at your doctor's office," he added.
🔮 In most cases, early-stage lung cancer will not come with any symptoms, according to Robinson.
🔮 The statement continued that recovery will "take time," but the young athlete acknowledged that she’s "incredibly fortunate to be surrounded by amazing people who continue to lift me up, encourage me, and remind me that every challenge is an opportunity to grow.
🔮 As Americans live longer, experts say everyday habits may be taking a toll on eye health earlier than expected.
🔮 Functional medicine expert Dr. Will Cole told Fox News Digital that peptides are "intimately connected" with longevity, cellular healing and metabolic health.
🔮 He couldn’t explain what made him do that, but he did," he said.
🔮 Hundreds of consumers are suing the manufacturers of GLP-1 receptor agonists, alleging the medications may increase the risk of a rare form of vision loss.
🔮 "When I was younger with them, I would try to explain what I think."
🔮 "I would imagine that it was taking in a tremendous amount of dust."
Also by Angelica Stabile
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Topics

Americans Fox News Digital Hyrox LaValle Texas

Subjects

LaValle PERSON · 6× Americans NORP · 1× Fox News Digital ORG · 1× Jim LaValle PERSON · 1× NIH ORG · 1× Texas GPE · 1×

Narrative

Some common nutritional supplements include zinc for immune function, ashwaganda for stress relief, fish oil for improving heart health and magnesium for better sleep, among others that have gained popularity on social media.
framing: mixed · carried by 1 article(s) · first seen 2026-10-21
🔮 In that case, he said, taking a magnesium supplement could help to balance out levels.

Claims (29 extracted, 7 hedged)

Supplements are a daily wellness habit for many Americans – but experts warn more isn’t always better. asserted
more → warn → Americans
Some common nutritional supplements include zinc for immune function, ashwaganda for stress relief, fish oil for improving heart health and magnesium for better sleep, among others that have gained popularity on social media. asserted
that → include → media
In an interview with Fox News Digital, Jim LaValle, a clinical pharmacist and metabolic medicine expert based in Texas, said that supplements should be balanced with other medications and medical conditions. asserted
supplements → base → medications
"I've never met a supplement I didn't like under the right circumstances," he said. asserted
he → meet → circumstances
"There's some evidence around what it's doing in the body." asserted
it → be → body
While supplementing certain nutrients can be beneficial, the health expert warned that overdoing it can be "problematic." asserted
overdoing → supplement → it
"A lot of people take one of everything and then stack peptides on top of it – and then they're going and doing 18 different things," he said. asserted
he → take → things
It's important to first assess what the body needs from an individualized approach, according to LaValle. uncertain
body → assess → LaValle
For example, low magnesium has been associated with the development of metabolic syndrome. asserted
magnesium → associate → syndrome
In that case, he said, taking a magnesium supplement could help to balance out levels. uncertain
taking → say → levels
"We assume that if you eat healthy, you're going to get those nutrients. asserted
you → assume → nutrients
But are the foods we're selecting actually rich in those nutrients?" he questioned. asserted
he → select → nutrients
LaValle recommends using supplements to address specific needs, starting with a blood test to pinpoint any deficiencies, rather than blindly treating symptoms. asserted
LaValle → recommend → symptoms
Low iron and ferritin are common among people complaining of fatigue, LaValle said, yet some may instead turn to supplements like ashwagandha or rhodiola in an effort to boost their energy. uncertain
some → complain → energy
"They’re buying some kind of stimulant adaptogen to try to get their energy up," he said. asserted
he → buy → energy
"That’s pretty basic — you’re low in iron, and you never got a blood test." asserted
you → ’ → test
"A lot of people take one of everything and then stack peptides on top of it." LaValle noted that the number of biomarkers measured is less important than how well the results are interpreted. asserted
results → take → biomarkers
After appropriate blood testing, the results can be used to identify "functional highs and lows" and help establish specific health goals, he said. asserted
he → use → goals
"If you're somebody who has a goal to get out there and get after it and do a Hyrox or an LT Games or a Tough Mudder, there could be supplements that would help improve your performance [or] reduce your risk of injury," LaValle said. uncertain
LaValle → have → injury
"It doesn't mean you [have to] take them all the time." asserted
you → mean → them
The expert reiterated that it’s easy to "overdo it," particularly with the influence of online health and wellness advice. " asserted
it → reiterate → advice
When people are getting barraged with marketing between social media and friends telling them, 'I did this and it worked,' they'll lean in and go, 'Hey, if two is good, four is better, and why not do 10?' asserted
four → barrage → 10
" In one example, having low levels of certain nutrients, such as zinc, can disrupt key functions in the body, as zinc plays an important role in immune health, cell growth and metabolism. asserted
zinc → have → health
But supplementing with too much zinc can cause digestive distress and even copper deficiency, which can lead to anemia and other neurological problems, according to the NIH. uncertain
which → supplement → NIH
"So having low zinc is not good, but you can overdo zinc," LaValle said. asserted
LaValle → have → zinc
"You can overdo vitamin A. asserted
You → overdo → ?
You can overdo vitamin D easily, and that could be potentially toxic if you're taking too much of it." uncertain
you → overdo → it
People should talk with a doctor or pharmacist before starting or combining supplements, particularly if they take prescription medications or have underlying health conditions. asserted
they → talk → conditions
Blood testing may also be appropriate before supplementing certain nutrients, experts advise. uncertain
experts → supplement → nutrients
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