Micronutrients and Strength Training: Which Vitamins and Minerals Do You Need?

By Roel van den Bogaard, personal trainer and founder of Aurora Personal Training in Eindhoven.

Vitamins and minerals support muscle function, energy metabolism and bone health, among other processes. Getting enough matters for strength training, but extra supplements do not automatically produce more muscle growth or faster recovery. Start with a varied diet and check whether specific supplementation recommendations apply to you.

Protein receives plenty of attention when discussing muscle growth. However, an appropriate eating pattern involves more than protein shakes and counting calories.

Vitamin D, B vitamins, calcium, magnesium, iron and other micronutrients also have important functions. Which deserve attention, and when might a supplement help?

This guide explains how to include micronutrients in your diet without assuming every tiring workout indicates a deficiency.

Micronutrients are vitamins and minerals your body needs in small amounts.

Trace elements, including iron, zinc and iodine, are also minerals. They are required in relatively small quantities.

Here is how they differ from macronutrients:

For example, B vitamins help your body release energy from food. This does not mean a vitamin tablet itself provides energy.

Read our guide to macronutrients.

Strength training involves coordinated work by muscles, nerves and other tissues. Vitamins and minerals contribute to the processes that make this possible.

A deficiency can affect health and normal functioning. However, consuming more than you need does not automatically improve training results.

Training more frequently does not automatically mean you need a multivitamin or individual mineral supplements either. The Netherlands Nutrition Centre advises most recreational exercisers to focus primarily on improving their eating pattern. [1]

The practical priorities are sufficient food, variety and attention to your individual needs.

This overview helps you recognise food sources. It is not a shopping list of supplements you need to buy.

Vitamin D supports calcium absorption and is important for bones and normal muscle function.

This does not make it an automatic muscle-building supplement. The relevant questions are whether you get enough and whether Dutch recommendations for additional vitamin D apply to you.

When is additional vitamin D recommended?

Examples of groups covered by supplementation advice include:

• People with darker skin.
• People who spend little time outdoors during daylight or cover most of their skin.
• Women aged 50 and over.
• Everyone aged 70 and over.
• Pregnant women.

The amount depends on the group. It is often 10 micrograms daily, increasing to 20 micrograms from age 70. Check the full recommendations for your circumstances. [2]

These are Dutch public-health recommendations, which are relevant if you live in the Netherlands.

Your workout time alone does not establish a deficiency. Training early or late does not necessarily mean you spend insufficient time outdoors.

Magnesium contributes to muscle function, nerve function and energy metabolism. That is different from demonstrating that extra magnesium improves your sleep, recovery or training performance.

Muscle cramps or a difficult workout do not establish a magnesium deficiency.

First, consider your diet and the circumstances in which symptoms occur. A healthcare professional can assess persistent or recurring symptoms more broadly.

Nuts, whole grains and pulses are practical ways to obtain magnesium through food.

Individual B vitamins have different functions. They should not all be assigned the same effects.

A demanding job, stress or strength training does not automatically mean you need a high-dose B-complex supplement.

Vitamin B12 deserves attention in a vegan diet

If you eat a vegan diet, vitamin B12 is a specific consideration. The Netherlands Nutrition Centre recommends B12 supplementation for people eating vegan. [3]

Other B vitamins occur across different foods. Variety helps you obtain a broader range of nutrients.

Iron is required for functions including the transport of oxygen in your blood.

Heavy menstrual bleeding or an eating pattern with few suitable iron sources deserves attention. Plant-based eating calls for deliberate choices, but does not automatically mean you have a deficiency.

For example, combine pulses or whole grains with vegetables or fruit containing vitamin C.

If you are persistently tired or become unusually breathless, seek assessment of the possible cause. Avoid starting iron supplements simply because your workouts feel harder.

Removing dairy, bread or other food groups changes more than your calorie or protein intake.

Replacing dairy

If you choose plant-based milk or yoghurt alternatives, check whether calcium and vitamin B12 have been added.

Not every plant-based drink has the same nutritional composition. Protein content also varies.

Eating little or no bread

Bread made with iodised bakery salt is an important iodine source in the Netherlands. If you eat little bread, consider which other sources you use. [4]

Seaweed or kelp supplements are not an automatic solution because their iodine content can vary considerably.

Iodine supports normal thyroid function. Taking additional iodine is not a method for increasing your metabolism to lose fat.

Vitamin C is required for collagen formation. Zinc contributes to processes including protein synthesis. Both have normal functions in the body.

However, these functions do not demonstrate that taking high doses after exercise makes your muscles recover faster.

Build a varied dietary foundation. Avoid adding high doses solely because a product label mentions “recovery”, “immunity” or “hormones”.

Sodium and potassium are examples of electrolytes. Sweating causes losses of fluid and salts.

A typical strength training session does not automatically require an electrolyte drink. Prolonged exercise, heavy sweating or hot conditions may call for a more individual approach.

Feeling dizzy or weak does not automatically indicate a sodium deficiency. Stop exercising if you feel unwell and assess what is happening.

Read our practical guide to hydration and strength training.

You do not need to track every vitamin separately. Start with repeatable food choices.

These are options, rather than a complete individual meal plan. Adjust portions and products to your needs and preferences.

Sufficient energy and protein remain important for muscle growth. Read more about nutrition and muscle growth.

A supplement may be appropriate when:

• Public-health recommendations apply to your group.
• A deficiency has been diagnosed and you receive specific advice.
• Your eating pattern does not adequately provide certain nutrients.
• A doctor or dietitian recommends supplementation for your circumstances.

Supplements do not replace a varied diet, sufficient food or recovery.

More is not automatically better

Check whether the same nutrients appear in your multivitamin, magnesium product and other supplements.

Excessive amounts of some vitamins and minerals can be harmful. For example, prolonged excessive vitamin B6 intake can cause nerve symptoms. [5]

A label showing more than 100% of the nutrient reference value is not evidence of greater effectiveness.

Fatigue, limited training progress and poor recovery have several possible causes.

Also consider:

• How much you eat.
• Sleep and work demands.
• The structure of your training programme.
• Recovery between sessions.
• Persistent health symptoms.

A food diary can help assess your eating pattern. It cannot diagnose a deficiency.

If symptoms persist, your GP can assess whether investigations are needed. A dietitian can help review your intake. Broad blood testing is not automatically necessary for every person who exercises.

Which vitamin is most important for muscle growth?

No single vitamin independently determines muscle growth. You need a range of nutrients alongside appropriate training, sufficient food and recovery.

Do you need a multivitamin if you lift weights?

Not routinely. Start with your diet and check whether specific supplementation recommendations apply to you.

Does magnesium help with muscle soreness or poor recovery?

Magnesium’s normal functions do not prove that extra magnesium will resolve these symptoms. Consider the wider picture and discuss persistent problems with a healthcare professional.

Does vitamin B12 give you more energy?

Vitamin B12 has important bodily functions, but a supplement does not provide calories. Fatigue alone does not establish a B12 deficiency.

Should you take more vitamins when you train more frequently?

Not automatically. Consider your overall diet, training demands and personal circumstances.

Can you get enough micronutrients from food?

A varied diet can provide a foundation for many nutrients. Some groups have additional recommendations, such as vitamin D supplementation or B12 for people eating vegan.

Do zinc and vitamin D increase testosterone?

Their normal bodily functions do not make them reliable testosterone boosters for someone already getting enough. Avoid using such claims as a reason to take high doses.

At Aurora Personal Training in Eindhoven, we consider your training programme alongside the habits surrounding it.

We discuss your eating routine, available time and recovery. The aim is to make the foundations practical: manageable meals and training in which you can track progress.

Suspected medical deficiencies should be assessed by a healthcare professional. Where appropriate, support from a dietitian can complement your training.

Book a free intake at Aurora Personal Training to discuss how training and nutrition can fit your goals and schedule.

1. Netherlands Nutrition Centre: do people who exercise need extra supplements?.
2. Netherlands Nutrition Centre: vitamin D and supplementation recommendations.
3. Netherlands Nutrition Centre: when are additional vitamins and minerals needed?.
4. Netherlands Nutrition Centre: getting enough iodine.
5. Netherlands Nutrition Centre: can too much vitamin B6 be harmful?.

The linked sources are in Dutch.