The common myth: "A multivitamin covers everything – the higher the dose, the better." This sounds convenient, but it is incorrect. Some vital nutrients only work in the right form, amount, and matrix. Others can be harmful in case of overdose or – like iodine from algae – disrupt the thyroid gland. Additionally, smoking specifically lowers vitamin C levels, even when diet is similar to non-smokers ^[1]. It is time to debunk myths and set priorities – for increased energy, focus, and longevity.

Vitamins and minerals are micronutrients – small in quantity, but significant in effect. Bioavailability is crucial, meaning how well the body absorbs and utilizes a substance. For omega-3, the source makes the difference: ALAAlpha-linolenic acid from plants is only converted to EPA/DHA to a limited degree, while EPAEicosapentaenoic acid and DHADocosahexaenoic acid from marine sources are directly effective ^[2][3]. Vitamin CAscorbic acid, water-soluble antioxidant acts as a cofactor for enzymes and supports immune defense, collagen formation, and the absorption of non-heme ironIron from plant sources ^[4]. IodineEssential trace element for thyroid hormones has a narrow reference window: too little slows down metabolism, while too much can also disrupt it ^[5][6]. IronCentral element for hemoglobin and oxygen transport determines performance; its bioavailability strongly depends on accompanying substances like phytates ^[7]. In short: it's not just the quantity that matters, but form, context, and balance.

For high performers, what matters is what can be measured. Omega-3 in the form of EPA/DHA lowers triglycerides, modulates inflammation signals, and supports cognitive functions – benefits that ALA alone hardly achieves ^[2][3]. Vitamin C stabilizes the immune system, protects against oxidative stress, and improves iron absorption from plant meals; however, its content in foods is sensitive to storage and processing ^[4]. Smoking specifically depletes the body's vitamin C stores – a gap that arises even with similar diets, with potential consequences for repair processes and defense ^[1]. For iodine, precision is key: excessive algae consumption can push intake above the upper limit and shift thyroid markers like TSH; particularly in older age, vulnerability increases ^[5][6]. Iron deficiency remains a leading cause of performance decline due to anemia globally; improved availability through preparation, combination with vitamin C, and suitable sources boosts energy, endurance, and cognitive presence ^[7].

A placebo-controlled study clearly distinguished the effects of smoking and diet for the first time: Despite similar fruit and vegetable intake, smokers showed selectively lower ascorbic acid levels; moderate supplementation specifically replenished these levels – other antioxidants showed hardly any difference without dietary variations ^[1]. This demonstrates how behavior-induced oxidative stress creates specific micronutrient gaps and how targeted replenishment can be effective. A narrative and a systematic overview of omega-3 show: EPA/DHA from marine or microalgae-based sources are clinically superior – with significant reductions in triglycerides, better inflammatory markers, and cognitive advantages; ALA converts inefficiently, while stearidonic acid-containing oils serve as a promising plant-based bridge to EPA ^[2][3]. This underscores why source and chemical form are strategically relevant. Micronutrient precision also includes safety management: a review documents the increase in vitamin D intoxications due to high-dose preparations and dosing errors – a lesson that "more" does not mean "better" and that quality, dosing guidance, and monitoring are essential ^[8]. At the trace element level, observational-intervention data on algae show: High iodine intake can shift thyroid parameters, while abstaining normalizes values; in older individuals, medications, kidney function, and microbiome exacerbate the instability of the thyroid axis ^[5][6]. Finally, a recent review on iron emphasizes that biofortified, wisely processed legumes improve bioavailability, thus providing practical, sustainable strategies against iron deficiency ^[7].

- Prioritize EPA/DHA: Eat fatty sea fish (e.g., salmon, mackerel, herring) 2–3 times a week. Vegan/vegetarian: Use microalgae oil (1–2 g/day EPA+DHA) or SDA-rich oils as a bridge to EPA. ALA from flaxseeds is healthy but does not fully replace EPA/DHA ^[2][3].
- Load Vitamin C wisely: Plan daily citrus fruits, peppers, broccoli, or berries. Cut fresh, cook gently. Combine vitamin C sources with plant-based iron (e.g., lentils + peppers) to enhance absorption ^[4].
- Manage iodine with sensitivity: Use iodized salt in cooking. Consume algae only moderately and with known iodine content; have thyroid values (TSH, fT4) checked with regular consumption, especially after 60 or with polypharmacy ^[5][6].
- Optimize iron in a practical way: Integrate red meat in moderate amounts or plant-based sources like spinach, lentils, and iron-rich beans. Reduce inhibitors (e.g., tea/coffee not directly with meals), use vitamin C accompaniments. Tip: Use cooking water from beans to minimize micronutrient losses ^[7].
- Avoid nutrient traps: Smoking specifically lowers vitamin C – those who smoke need more consistent vitamin C intake or should plan to quit; supplements should only be used strategically and correctly dosed to avoid deficiencies or overdoses like with vitamin D ^[1][8].

The next evolutionary stage of micronutrient strategy is precise, context-dependent, and data-driven: right form, right dose, right timing. In the coming years, we expect personalized recommendations that integrate biomarkers, microbiome, and lifestyle – so that vital nutrients are not left to chance, but intentionally scale your performance.