In some situations, supplements can be helpful (i.e.: DPA and EHA Omega-3 fatty acids for pregnant women who do not eat fish; vitamin D supplements for most people in Northern climates).
However, the supplement market mostly preys on consumer fear ("There aren't enough nutrients in the food I'm eating") and ignorance ("I won't gain muscle unless I down 300 grams of protein a day.")
You certainly can't rely on "health stores" for advice!
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