Supplements
19 questions in this area. Each answer starts with the short version, carries an evidence grade and links its sources.
- Are BCAAs worth it, or a waste of money?If you already eat enough protein, BCAAs add essentially nothing. What builds muscle is already in ordinary protein-rich food, and three isolated amino acids don't do the job better than a complete protein.
- Do fat burner pills actually work?No, not the way the label promises. Most ingredients lack convincing support, and the few that do anything measurable (mainly caffeine and green tea) produce a small effect that a real deficit in the kitchen beats comfortably.
- Do I need supplements at all if I eat a healthy diet?If you eat a varied diet, most people need no supplements at all. A few are worth taking in specific situations, like vitamin D in winter or B12 if you eat fully plant-based, but the rest of the shelf rarely adds anything.
- Do I need to take a vitamin D supplement, especially in winter?At Nordic latitudes your skin makes no vitamin D from the sun during the winter half of the year, so a modest supplement is reasonable for many people in Sweden during that stretch. It is about keeping your level normal, not about preventing disease with high doses.
- Do I need to take omega-3 or fish oil?For most people who eat fish regularly, no. Large trials show omega-3 supplements have little or no effect on heart health, while fish itself is linked to lower risk. If you rarely eat fish, a modest source can be reasonable to cover your intake.
- Do multivitamins actually do anything?For someone who already eats a reasonably varied diet, a daily multivitamin has little or no measurable effect on health, longevity or disease risk. With a genuine deficiency or a raised need, targeted supplementation is a different matter.
- Do natural testosterone boosters work?No, not the way the label promises. Most ingredients lack support for raising testosterone in healthy men, and the reviews that exist describe the marketing claims as unsubstantiated.
- Do you have to do a loading phase with creatine?No. A loading phase fills your muscle creatine stores faster, but 3–5 grams a day reaches exactly the same saturation. It just takes three to four weeks instead of one.
- Do you need glutamine for muscle recovery?No, not if you're healthy and eat enough protein. Your body makes glutamine itself and you get plenty from food, and controlled studies on people who train show no added effect on strength, muscle or recovery.
- Does ashwagandha work for stress and strength?Ashwagandha is one of few herbal supplements with several controlled trials behind it, and for stress and sleep they lean toward a real but modest short-term effect. For strength the evidence is thinner and less certain, and long-term data is largely missing.
- Does caffeine actually make you train better?Yes. Caffeine is one of the few supplements where the evidence actually holds up. A dose of 3–6 mg per kilo of body weight about an hour before training gives most people a small-to-moderate performance boost, clearest in endurance work. The effect varies between people, but the direction is consistent.
- Does collagen supplementation work for skin and joints?Partly. Studies show a small but measurable improvement in skin hydration and elasticity, and some joint symptoms ease. But much of the research is done on small groups and funded by the industry, so keep expectations modest.
- Does creatine cause hair loss?There is no support for the idea that creatine causes hair loss. The worry rests on a single small study that measured a hormone in the blood, never the hair, and that no one has been able to repeat.
- Does magnesium help with sleep and muscle cramps?For cramps the best evidence points to little or no effect. For sleep it is thin and mixed, with perhaps a slightly faster time to fall asleep but little beyond that. Magnesium matters most if you are genuinely low on it.
- Is creatine bad for your kidneys?No. Creatine is one of the most studied supplements there is, and the research shows no evidence of kidney damage in healthy adults at normal doses (3–5 g per day).
- Is pre-workout bad for you?For healthy adults, pre-workout at normal doses is generally safe in the short term, and the tingling or itching skin that unsettles many people is a harmless effect of beta-alanine. The one thing genuinely worth watching is the caffeine.
- Should teenagers use protein powder and creatine?Neither is necessary, and neither is dangerous for a healthy teenager who trains. Protein powder is just a convenient way to get protein you could just as easily eat, and creatine is one of the most studied supplements with no evidence that it harms young bodies.
- When is the best time to take creatine, before or after a workout?The timing barely matters. What decides creatine's effect is taking it every day so your muscles' stores stay full, not whether the dose lands before or after the workout.
- Will creatine make women bulky or bloated?No. Creatine does not make women bulky or bloated. The small amount of weight that can appear early on is water inside the muscle cell, not puffiness under the skin, and women rarely build visible muscle volume from it.