Explore muscle function, bone health, sleep, mood and hormone research, with practical guidance for your supplement routine.
By Evolution Supplements · Updated 3 November 2026
How do these nutrients support a bodybuilding routine?
Sleep, hormone health and muscle building are closely linked in a training routine, but they are not the same outcome. A nutrient may be essential for normal muscle function without a supplement automatically adding muscle. A promising sleep study also does not establish that a formula raises testosterone.
Vitamin D3, zinc, magnesium, vitamin B6 and fish oils each have a different role. The most useful approach is to understand that role, review your food intake and choose supplements around your circumstances.
Vitamins and minerals are micronutrients, meaning the body needs relatively small amounts. Fish oils supply fats, particularly the omega-3 fatty acids EPA and DHA. Bone health, joints and mood also matter when building a sustainable training routine. This guide brings the training questions together; our magnesium forms guide and omega-3 guide cover the product formats in more detail.
Nutrient
Useful nutritional context
How to read the training discussion
Vitamin D3
Muscles, bones, calcium handling and research on mood.
Correcting low status is different from expecting a testosterone boost.
Zinc
Protein synthesis and normal testosterone levels.
Adequate intake supports normal function; extra intake is not a proven universal booster.
Magnesium
Muscle and nervous-system function.
Sleep trials show some encouraging but variable results.
Vitamin B6
Protein metabolism, nervous-system function and hormonal activity; specialist prolactin research.
These roles do not establish a direct muscle-building or sedative effect.
Fish oils
EPA and DHA intake.
Joint, mood, sleep and muscle research needs to be considered separately.
Vitamin D3: muscle function, seasonal intake and testosterone
Vitamin D3, also called cholecalciferol, is a form of vitamin D. It contributes to normal muscle function and helps the body absorb and use calcium and phosphorus. Oily fish, eggs and fortified foods contribute vitamin D; skin also produces it with appropriate sunlight exposure.
UK autumn and winter deserve particular attention. NHS advice is that adults should consider a daily supplement containing 10 micrograms (400 IU) of vitamin D during those seasons. Some people are advised to consider it throughout the year.
Bone health and food sources
Vitamin D helps calcium and phosphorus from food become available to the body. Those minerals contribute to bone structure, and vitamin D helps maintain normal bones. Adequate nutrition is relevant when resistance training places regular demands on the skeleton.
Oily fish such as salmon, sardines and mackerel, egg yolks and some fortified foods contribute vitamin D. Check labels on fortified milks, plant drinks and cereals, as amounts vary.
Vitamin D3 and mood
Researchers have investigated vitamin D in relation to mood, partly because low vitamin D status and depressive symptoms can occur together. That association alone cannot show that low vitamin D caused the symptoms.
Some smaller studies in selected groups report improvements, while a large trial involving more than 18,000 older adults did not find that vitamin D3 prevented depression or improved mood scores. Maintaining adequate intake is worthwhile for its established nutritional roles; a mood improvement is not something every person should expect. Persistent low mood deserves support rather than simply increasing a supplement dose.
Does vitamin D3 raise testosterone?
Some studies associate low vitamin D status with lower testosterone, but an association cannot show which factor caused the other. Trials of supplementation have produced mixed findings. A randomised trial in men with low testosterone did not find a significant testosterone increase after vitamin D treatment, and recent pooled evidence has not established a consistent effect.
The clear reason to review vitamin D is its nutritional role and your risk of low intake or status. It should not be presented as a reliable testosterone booster or a direct muscle-growth shortcut.
What about sleep?
Vitamin D is not a bedtime sedative. Its place in a routine is maintaining adequate intake, rather than expecting an immediate effect after an evening tablet.
PER4M Vitamin D3 + K2 combines the two vitamins in a tablet format. Check the current nutrient amounts and your other supplements before choosing a daily intake. Vitamin K has its own nutritional role; adding it does not make high vitamin D intakes automatically appropriate.
Zinc: normal testosterone and protein synthesis
Zinc contributes to the maintenance of normal testosterone levels in the blood and to normal protein synthesis. Protein synthesis means the body making proteins for its tissues and other functions; muscle tissue is part of that wider picture.
Small studies involving zinc restriction and people with low zinc status help explain interest in the relationship with testosterone. Restoring adequate intake in someone who is deficient is different from raising testosterone in someone already getting enough zinc.
Meat, shellfish, dairy foods, beans, nuts and wholegrains can contribute zinc. A supplement can be a convenient targeted option when it suits the overall diet.
Applied Nutrition Zinc provides 15mg zinc as zinc bisglycinate and 60mg vitamin C per capsule, with directions for one capsule daily with food. Check the zinc already supplied by multivitamins and mineral blends.
Zinc is also a familiar ingredient in ZMA-style formulas. Its presence does not establish that a finished product will improve sleep or produce additional muscle gains.
Magnesium: muscle function, repair processes and sleep
Magnesium contributes to normal muscle function, the nervous system and electrolyte balance. It is found in foods such as nuts, seeds, wholegrains and green leafy vegetables.
Muscle repair and other everyday functions
After training, the body repairs and remodels muscle tissue through processes that include making new proteins. Magnesium contributes to normal protein synthesis, which is why adequate magnesium intake belongs in the wider recovery picture. This nutritional role does not establish that taking extra magnesium speeds up muscle repair or prevents soreness.
Magnesium also contributes to normal energy-yielding metabolism, normal psychological function, the reduction of tiredness and fatigue, and the maintenance of normal bones and teeth. Normal psychological function is a nutritional role, rather than a claim that magnesium treats anxiety or depression.
For muscle recovery, combine adequate mineral intake with enough protein, food and rest. If cramps occur, remember that fatigue, workload and other factors can contribute; a cramp alone does not diagnose magnesium deficiency.
Can magnesium help sleep?
There are encouraging findings, particularly in some people reporting poor sleep, but the effects are not uniform. A 2025 placebo-controlled trial of 155 adults found a small improvement in insomnia symptom scores after four weeks of magnesium bisglycinate. It used 250mg elemental magnesium daily; this describes the study rather than a personalised dose recommendation.
Broader reviews describe mixed results and low certainty. An evening magnesium routine may suit some people, while it is not an established treatment for insomnia. Assess tolerance and how it fits your routine rather than expecting every magnesium form to have the same sleep effect.
Magnesium options in our range
Evolution Supplements® Triple Magnesium Complex combines malate, buffered glycinate and taurate, with zinc and vitamin B6. Three capsules provide 387mg elemental magnesium, 5.04mg zinc and 1.38mg B6. Follow the labelled directions of one capsule, one to three times daily; the three-capsule figures are the full upper labelled serving, not the content of one capsule.
PER4M Advanced Magnesium supplies 300mg elemental magnesium from bisglycinate per two capsules. Elemental magnesium is the amount of the mineral itself, rather than the weight of the complete magnesium compound.
Magnesium's nutritional importance does not establish that adding it raises testosterone or increases muscle size in someone with adequate intake. For differences between forms, read Magnesium Explained.
Vitamin B6: protein metabolism and hormonal activity
Vitamin B6 contributes to normal protein and glycogen metabolism, normal nervous-system function and the regulation of hormonal activity. Glycogen is stored carbohydrate, which the body can draw on for energy.
These functions explain why B6 appears in multivitamins and mineral combinations. “Regulation of hormonal activity” is a broad nutritional role; it does not mean a B6 capsule selectively raises testosterone.
B6 is involved in making chemical messengers used by the nervous system, which helps explain interest in sleep. However, involvement in a biological pathway is not proof of improved sleep after supplementation. Research on dream recall also should not be confused with evidence of deeper or more restorative sleep.
Can vitamin B6 lower prolactin?
Prolactin is a hormone made by the pituitary gland, a small gland beneath the brain. It is best known for its role in milk production, and is also present in men. Abnormally high levels can affect reproductive hormone signalling. Lowering a normal level is not a general bodybuilding goal.
Vitamin B6 helps the body make neurotransmitters, including dopamine, which helps regulate prolactin release. This provides a biological reason for research, but does not establish the effect of a normal supplement serving.
A controlled clinical study found that high-dose B6 reduced raised prolactin in men whose antipsychotic medication had caused the elevation. A later evidence review also found a signal in that specific setting. The research used pharmacological amounts far above everyday nutritional supplementation, with clinical monitoring.
These findings should not be presented as proof that a multivitamin, ZMA formula or ordinary B6 supplement lowers prolactin in healthy gym-goers. Do not copy the high-dose regimens: excess B6 can cause nerve damage. A raised prolactin blood result needs medical assessment to identify the cause and appropriate management.
PER4M ZMA+ combines B6 and zinc with magnesium bisglycinate, citrate and oxide. It offers a convenient combined format. ZMA research has not consistently shown additional testosterone, strength or muscle gains in resistance-trained adults.
Fish oils: EPA, DHA and emerging research
Fish oils supply EPA and DHA, long-chain omega-3 fatty acids used in cell membranes and other processes. Oily fish provides them through food; supplements offer another way to add these fats to a routine.
Fish oils and joints
EPA and DHA contribute to cell membranes and are involved in the production of signalling molecules related to inflammation. That helps explain interest in omega-3 for joint comfort.
Much of the clinical research concerns rheumatoid arthritis rather than everyday gym aches. Some reviews report improvements in particular measures, such as tender joint counts, while others find small or uncertain benefits. Those findings cannot be treated as proof of cartilage repair, injury prevention or relief of every type of joint pain in healthy lifters.
Fish oil can fit a broader nutrition routine alongside sensible training loads and recovery. Persistent pain, swelling or an injury calls for assessment rather than relying on a supplement.
Fish oils and mood
Omega-3 fats are relevant to brain biology, and trials have examined their effect on depressive symptoms. Some pooled analyses find improvements, especially in people with existing depression, while a Cochrane review judged the evidence uncertain and the average benefit small. Different EPA/DHA formulas and participant groups help explain why results vary.
Research in diagnosed depression does not mean an everyday fish oil supplement reliably lifts mood in a healthy person. It can be a way to add EPA and DHA to your diet; it should not replace prescribed treatment or support for persistent low mood.
Sleep
A 2024 review of eight controlled studies found improvements in sleep efficiency and some self-reported measures. Sleep efficiency is the proportion of time in bed spent asleep. It did not find a significant overall improvement in total sleep duration or the time taken to fall asleep. Study differences mean this is an area of interest rather than a guaranteed sleep effect.
Testosterone
One secondary analysis of a fish-oil trial reported an increase in testosterone in overweight and obese men using a DHA-rich formula. A much larger trial in older men did not find a significant effect. Different populations, formulations and study designs limit what can be concluded for a healthy bodybuilder. Fish oil is not an established testosterone-boosting supplement.
Muscle building
Research has explored muscle protein responses, strength and muscle mass, with some positive findings in particular groups, including older adults. Results do not consistently show extra muscle or strength in healthy adults, and cannot be assumed to apply to every resistance-trained person.
PER4M Advanced Omega-3 provides 500mg EPA and 250mg DHA per softgel. Compare those amounts, rather than fish-oil weight alone. Its listed directions are one softgel daily with food. It contains fish and a bovine gelatin capsule.
Choose a multivitamin or individual nutrients around your diet, label directions and any professional advice. Nutritional needs continue on rest days. Taking a selected daily formula consistently is more practical than changing servings according to how hard you trained.
A multivitamin, ZMA-style formula and separate minerals are not automatically needed together. Add up vitamin D, zinc, magnesium and B6 across the full daily servings. Our Multivitamins for Bodybuilding Guide explains how to read the combinations.
B6: NHS advice is not to exceed 10mg daily in supplements without medical advice; excessive intake can damage nerves.
Zinc: NHS advice is not to exceed 25mg daily from supplements without medical advice. High intakes can interfere with copper absorption.
Vitamin D: avoid more than 100 micrograms (4,000 IU) daily unless directed by a clinician. This is an upper limit, not a target.
Magnesium: supplements can cause loose stools or stomach discomfort; ask about suitability with kidney disease and timing around certain medicines.
Combinations: ask a pharmacist before fish oil if taking anticoagulants, or a K2-containing product if taking warfarin.
Persistent poor sleep, unusual fatigue or suspected low testosterone deserve an individual assessment. These symptoms have several possible causes and cannot identify a nutrient deficiency on their own.
Training, sleep, mood and hormone FAQs
Which nutrient is best for testosterone?
Zinc has an established role in maintaining normal testosterone levels. The useful choice depends on your diet and nutritional status; none of these products is a universal treatment for low testosterone.
Should I take all five before bed?
No single timing rule applies to all of them. Follow each selected product's directions. An evening mineral formula may fit your routine, while food-directed products can be paired with an appropriate meal.
Can I use a multivitamin with Triple Magnesium Complex?
Compare the complete daily amounts, especially zinc and B6, before combining them. The appropriate combination depends on the multivitamin, serving sizes and your individual circumstances.
Will these supplements replace protein or creatine?
They serve different roles. Protein supplies amino acids, creatine has a defined exercise-performance role, and the nutrients discussed here contribute to broader nutrition.
Explore vitamins, minerals and fish oils
Read the current labels and choose a format around your diet and preferred routine.
General information for adults. Follow product directions and check allergens. Seek qualified advice if pregnant, breastfeeding, taking medication or managing a medical condition. Supplements should complement a varied, balanced diet and healthy lifestyle.
