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Oral supplements have to pass through the digestive system and may not be absorbed efficiently, especially in people with gastrointestinal conditions like celiac, Crohns, or gastritis

Abandoning products after days or even 2-3 weeks because nothing is happening prevents ever experiencing the actual benefits

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But, Vitamin B12 can help repair DNA, making them less effective

[104] Anhydrous caffeine is the preferred form of caffeine for pre-workout formulas because it's rapidly absorbed and fast-acting

Severe allergic reactions (anaphylaxis) can occur, which is why observation after vaccination is standard practice