What supplements should a weightlifter take to build muscle?

Fill or move: the decision a weightlifter makes before any product, the arithmetic of each aim, and why the same two supplements are used with different numbers

What supplements should a weightlifter take to build muscle is a question that, for a lifter who competes in a weight class, has a decision in front of it that a gym lifter never makes: fill or move. Muscle is weight, and a weightlifter's weight is a number with a limit on it, so building muscle means one of two things. The fill aim is to build muscle inside the current class, replacing fat with muscle at the same body weight, so that the lifter weighs in at the same number with more of it producing force; it is the aim of a lifter who makes their class comfortably and wants to be stronger in it. The move aim is to build muscle in order to go up a class, adding mass on purpose with the next class's limit as the target, which is the aim of a lifter who has filled their class, who is cutting hard to make it, or whose frame belongs in the class above. The two aims use the same two supplements, creatine and protein, and the same training, and they differ in the arithmetic around them, which is why the decision is made before the shelf is read.

The fill aim runs at maintenance or a small deficit, and it leans on the recomposition research, which finds that a trained lifter can add muscle while losing fat at the same body weight when protein is at the top of the range, around 1.6g per kilogram a day or somewhat above it, the training is kept heavy and the deficit, if any, is small; a large deficit loses muscle with the fat and defeats the aim. Creatine is held at 3 to 5g a day throughout, with its kilogram of intramuscular water already in the lifter's class arithmetic from the first day it was taken, so that it is never loaded or stopped around a weigh-in. The protein comes from food first and a powder for the shortfall, bought from a product enrolled in a certification programme, and the lifter's weight is watched over a block rather than a day, because recomposition is slow and the scale will not show it while the mirror and the bar will.

The move aim runs a modest surplus, a few hundred calories a day above maintenance, with the next class's limit as the target weight and the time to reach it set by the surplus rather than the calendar; a larger surplus adds fat faster than the muscle-building rate can use it, which the lifter then has to cut back under the new limit, losing muscle on the way. Protein stays at around 1.6g per kilogram, creatine stays at 3 to 5g, and the surplus comes from food rather than from a mass gainer, which delivers the calories as sugar and fat with the muscle-building rate unchanged. The lifter moving up plans the creatine kilogram and the surplus together against the limit, and arrives at the new class with muscle rather than with a cut to make.

A decision with two arithmetics and two supplements held constant, and the products placed by what they do to the class and the test, the under-18 note and the worked example, which is the next section.

The products placed by what they do to the class and the test: creatine and protein inside both aims, mass gainers and boosters outside, the strict liability rule over every tub; the under-18 note; the worked example; and the verdict

Every product a weightlifter considers for building muscle is placed by two questions, what it does to the class and what it does to the test. Creatine passes both when managed: it adds a kilogram of water that is planned into the class, it adds one to two kilograms of lean mass over a block on top of training in the meta-analyses, which is the aim, and it is bought as plain monohydrate from an enrolled product checked by lot for a tested lifter. Protein passes both: it adds no mass beyond the calories it carries, it is the material the muscle is built from at around 1.6g per kilogram, and it is bought as food first and as a certified powder for the shortfall. Caffeine is a platform product rather than a muscle one and sits in the class arithmetic at zero. Vitamin D through the winter adds nothing to the class and corrects the commonest shortfall.

Mass gainers fail the class question under both aims: under the fill aim they add calories the aim does not want, and under the move aim they add them as sugar and fat beyond what the muscle-building rate can use, so that the lifter reaches the next limit with fat to cut rather than muscle to lift; food delivers the surplus with protein and satiety and without the sugar. Testosterone boosters fail the test question and the evidence question at once: the audits found almost no data and no effect on the hormone, and the products' undeclared ingredients are the category in which strict liability findings arise, which for a tested weightlifter is a career rather than a wasted tub. The amino acid blends, the HMB sold for muscle preservation and the recovery formulas add nothing to adequate protein and carry the same contamination risk without the benefit. Under strict liability the rule over every tub is the same: enrolled in a certification programme, checked by lot number in the public database, or not taken, and the certification database is read before the checkout under either aim.

The under-18 note belongs on a page about building muscle in a sport that recruits young and tests its youth competitions: a young weightlifter builds muscle on food, sleep and a coach's programme, takes no supplement on the strength of a page, creatine included, and talks to a coach and a doctor, with the sport's own anti-doping education as the first reading; the fill-or-move decision for a growing lifter is made with the coach, because the frame is still deciding which class it belongs in.

The worked example is placed inside the class, adding nothing to it: {FL}, 1500mg magnesium bisglycinate stated as 300mg elemental at 80% NRV, two capsules with the evening meal, with authorised claims for normal muscle function, normal protein synthesis and electrolyte balance, a mineral lost in sweat and found short in a share of young adults' plates, batch tested for lead, mercury, arsenic and cadmium with the certificate by lot, UK made, 180 capsules for £19.99 at 22p a day, and not enrolled in a banned-substance programme, which a tested weightlifter notes and chooses a certified mineral instead. The full label breakdown is here.

The verdict: a weightlifter building muscle decides fill or move before reading a label. Fill the class at maintenance or a small deficit with protein at the top of the range and creatine held; move up a class on a modest surplus from food with the next limit as the target and the creatine kilogram planned in. The two supplements are the same under both aims, creatine and protein, bought certified and checked by lot; the mass gainers fail the class and the boosters fail the test; and a young weightlifter builds on food, sleep and a coach.

What to check on the label

Questions people also ask

How does a weightlifter build muscle without going up a weight class?

By filling the class: recomposition, replacing fat with muscle at the same weigh-in number, which the research finds a trained lifter can do at maintenance or a small deficit when protein is at the top of the range, around 1.6g per kilogram a day or somewhat above, the training is kept heavy and the deficit is small, since a large deficit loses muscle with the fat; creatine is held at 3 to 5g a day throughout with its kilogram of water already in the class arithmetic, the protein comes from food and a certified powder for the shortfall, and the weight is watched over a block while the bar and the mirror show the change.

Should a weightlifter use a mass gainer to move up a class?

No; a mass gainer delivers a thousand or more calories as sugar and fat with the muscle-building rate unchanged, so the lifter reaches the next limit with fat to cut rather than muscle to lift, and many gainers are uncertified, which under strict liability is a risk; the move aim runs a modest surplus of a few hundred calories a day from food, with protein at around 1.6g per kilogram, creatine held and the next class's limit as the target, so that the lifter arrives at the new class with muscle and the creatine kilogram planned in rather than discovered at the weigh-in.

What supplements build muscle for a weightlifter?

The same two under either aim, with different numbers around them: creatine monohydrate at 3 to 5g a day, for one to two kilograms of lean mass and a few percent on strength over a block on top of training, bought as plain powder from a product enrolled in a certification programme and checked by lot, and protein as food first and a certified powder for the shortfall toward around 1.6g per kilogram; vitamin D through the winter and caffeine timed for the platform sit beside them, and the boosters, amino blends, HMB and recovery formulas add nothing and carry a strict liability risk.

Can a tested weightlifter take creatine safely?

Yes, with two rules: it is bought as plain monohydrate from a product enrolled in a sports certification programme and the lot number on the tub is checked in the programme's public database before it is opened, because creatine is a commodity repackaged from a few global manufacturers and the batch screen is the only check on contamination; and its kilogram of intramuscular water is planned into the class from the first day it is taken, never loaded or stopped around a weigh-in, so that the class arithmetic includes it under the fill aim and the move aim alike.

Should a young weightlifter take supplements to build muscle?

No; a weightlifter under eighteen builds muscle on food, sleep and a coach's programme, takes no supplement on the strength of a web page, creatine included, since the trials were run in adults, and talks to a coach and a doctor, with the sport's own anti-doping education as the first reading because youth competitions are tested; the fill-or-move decision for a growing lifter is made with the coach, because the frame is still deciding which class it belongs in and the surplus or deficit that suits an adult does not suit a body still growing.

Sources

1. The body recomposition literature: simultaneous muscle gain and fat loss is documented in resistance-trained and untrained people under high protein intakes of around 2.2 to 3g per kilogram with a modest energy deficit, most readily in beginners, those returning after a break and those with higher body fat, and is slower than pursuing either goal alone. PubMed record
2. The acute weight loss literature in weight-class sports: rapid water cuts of several percent of body mass before a weigh-in impair strength, power and endurance in proportion to the loss and the recovery time available, with the sports' own guidance favouring a weight class close to walking weight and a modest, gradual cut over a large acute one. PubMed record
3. Rawson ES, Volek JS. Effects of creatine supplementation and resistance training on muscle strength and weightlifting performance. Journal of Strength and Conditioning Research 2003;17(4):822-831: creatine with resistance training produced around 8 per cent greater gains in maximal strength and around 14 per cent greater gains in repetitions at a given load than training alone. PubMed record
4. The resistance training hypertrophy literature: muscle growth tracks weekly set volume with diminishing returns beyond around ten to twenty hard sets per muscle, progressive overload, proximity to failure, protein around 1.6 grams per kilogram and adequate sleep, with creatine the one supplement adding measurably to lean mass gains. PubMed record

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