Maintaining strength and muscle mass as we age is crucial for preserving independence, preventing falls, and ensuring quality of life. Among the strategies studied by science, creatine stands out due to the solid evidence confirming its effectiveness and safety when combined with a consistent strength training program.

What is creatine and how does it work in the body?

Creatine is an essential substance for the rapid production of energy in muscles and the brain. It acts as a kind of energy reserve that the body uses during intense, short-duration efforts, such as lifting weights or performing movements that require explosive strength.

1. Creatine produced by the body

The body produces creatine daily through reactions that occur primarily in the liver, kidneys, and pancreas. To do this, it uses amino acids already present in food: glycine, arginine, and methionine. Most of the creatine produced internally is sent to muscle tissue, where it acts as immediate fuel for muscle contraction.

Internal synthesis supplies approximately half of the daily requirement, which is around two grams per day. The remainder usually comes from food.

2. Creatine obtained through diet

Foods with the highest amounts of creatine are red meat and fish. People who regularly consume these foods usually ingest about one gram of creatine per day. Vegetarians and vegans, on the other hand, have lower values ​​due to the absence of animal sources in their diet. This does not mean a lesser response to the supplement. On the contrary, these groups tend to show a proportionally greater increase in muscle stores when supplementing, because they start from lower baseline levels.

3. Creatine in supplement form

Supplements primarily use creatine monohydrate, the most studied form and the one with the best balance between effectiveness, safety, and cost. When ingested in powder or capsule form, creatine is absorbed by the intestine, carried into the bloodstream, and stored in the muscles. Supplementation allows for raising muscle stores to levels beyond what diet and internal synthesis can achieve. This saturation increases the muscles' ability to perform intense and repetitive workouts, which promotes gains in strength and lean mass.

→ Important to highlight: Isolated creatine, without exercise, tends not to offer significant benefits for muscle mass or strength. Creatine delays muscle fatigue, allowing for longer and more intense workouts. It is this increased training load that generates hypertrophy and strength gains, not just the pill itself.

What research shows in older adults

In recent years, several clinical trials have reinforced the effectiveness of creatine in the elderly. By combining resistance training 2 to 3 times a week with daily supplementation of 3 to 5 g, participants showed:

• An average of 1,4 kg of additional lean mass after four months, compared to placebo;

• Increased strength in exercises such as leg press and bench press;

• Improvement in functional tests, such as the sit-to-stand test, related to the risk of falls;

• Partial maintenance of gains for up to 12 weeks after discontinuing the supplement, provided that training was maintained.

There is also promising evidence in populations with greater muscle weakness, such as older adults with sarcopenia, suggesting improved functionality and independence.

Dosage, protocol, and ideal timing

To achieve muscle saturation, there are two known approaches:

1. Slow protocol (the most practical):

3 g per day continuously.

It reaches the same saturation level as the loading phase, but without peaks and with greater gastrointestinal comfort.

2. Loading protocol:

20 g per day divided over a week, followed by a maintenance dose.

Used by athletes, but not necessary for older adults.

The literature also assesses the moment of consumption: Some research suggests that taking creatine immediately after a workout may provide a slight advantage, although the difference is not yet conclusive.

Safety and side effects

Among all sports supplements, creatine is among the most studied and has the best safety record when used in recommended doses. The most common side effect is a slight increase in weight, resulting from water retention within muscle cells.

Regarding kidney health, the main point of confusion is the increase in creatinine, a marker used in blood tests. Since creatinine is a product of the breakdown of creatine, its elevation during supplementation may not indicate kidney damage, but only greater availability of the molecule.

For patients with a history of kidney disease or diagnostic uncertainty, doctors may request alternative markers, such as cystatin C, which is not affected by the supplement.

Purity and contaminants

Because they are not regulated with the same rigor as medications, supplements can exhibit variations in quality. Independent analyses have already found batches with contaminants exceeding recommended levels, reinforcing the importance of choosing products certified by organizations such as:

• ANVISA 

• ABENUTRI 

These bodies guarantee the absence of prohibited substances and adequate purity standards.

Why is it difficult to get enough creatine through diet alone?

To consume 3g of creatine exclusively through diet, it would be necessary to ingest very large quantities of meat, something unrealistic for most people, especially considering:

• Increased calorie consumption;

• Formation of potentially harmful compounds during cooking, such as heterocyclic amines;

• Environmental and ethical impact of excessive meat consumption.

Furthermore, the brain maintains its own control over creatine, independent of dietary intake; a change in diet affects the muscle more than the central nervous system.

Creatine, homocysteine, and vitamin B12: an important relationship in plant-based diets.

The body's internal production of creatine utilizes metabolic processes that release homocysteine, a molecule that, when elevated, is associated with a higher risk of cardiovascular disease. The body neutralizes this compound using vitamins B6, B12, and folate.

In vegetarians and vegans, vitamin B12 deficiency is common when there is no adequate supplementation. This can contribute to increased homocysteine ​​levels.

Practical recommendations:

• Combine creatine with resistance training (2 to 3 times per week) to maximize benefits.

• Use approximately 3 g per day to maintain stable muscle saturation.

• Continue supplementation for at least 12 weeks along with training to see consistent results.

• Consult a doctor before starting, especially if you have a history of kidney disease.

• Choose creatine products with high purity and certified by independent testing.

• Supplement with B12, with doses such as 50 mcg daily or 2.000 mcg once a week.

Creatine is not a magic bullet. Still, it is one of the most well-studied, safe, and effective strategies for preserving muscle mass, increasing strength, and improving functionality in older adults. When combined with strength training, it becomes a valuable tool for promoting independence, reducing the risk of falls, and fostering a more active and healthy aging process.

Sources:

Gualano, B., Rawson, ES, Candow, DG et al. Creatine supplementation in the aging population: effects on skeletal muscle, bone and brain. Amino Acids 48, 1793–1805 (2016). 
https://doi.org/10.1007/s00726-016-2239-7

Chilibeck PD, Kaviani M, Candow DG, Zello GA. Effect of creatine supplementation during resistance training on lean tissue mass and muscular strength in older adults: a meta-analysis. Open Access J Sports Med 2017 Nov 2;8:213-226.
https://doi.org/10.2147/OAJSM.S123529

Yazigi Solis M, de Salles Panelli V, Giannini Artioli G, Roschel H, Concepción Otaduy M, Gualano B. Brain creatine depletion in vegetarians? A cross-sectional 1H-magnetic resonance spectroscopy (1H-MRS) study. British Journal of Nutrition. 2014;111(7):1272-1274.
https://doi.org/10.1017/S0007114513003802