Can I Take Creatine with Testosterone Cypionate?

Is There a Known Interaction Between Creatine and Testosterone Cypionate?

Creatine is a compound the body makes from glycine, arginine and methionine, and it is also found in meat and fish. It is sold over the counter, and a Drugs@FDA search returns no approved drug application with creatine as the active ingredient [4][5]. Testosterone cypionate is a prescription testosterone ester and a Schedule III controlled substance. It is injected deep into the gluteal muscle in oil, is absorbed slowly, and can be given at intervals of two to four weeks [1].

The Depo-Testosterone label's drug interactions section names three: androgens may increase sensitivity to oral anticoagulants, so the anticoagulant dose may need to be reduced; concurrent oxyphenbutazone may raise its serum level; and in diabetes the metabolic effects of androgens may lower blood glucose and insulin requirements [1]. Creatine is not among them.

Does Creatine Change Testosterone Levels or the Injection Itself?

Creatine is not a testosterone booster. In a double-blind crossover study, 11 healthy young men took 20 g/day of creatine for 5 days and did a standardized heavy resistance session before and after. The exercise-induced rise in growth hormone was not altered, and the training session did not significantly change serum testosterone on either treatment [6].

What creatine does measurably is raise muscle phosphocreatine and improve short bursts of high-intensity work. In nine healthy men, 6 days of creatine at 0.5 g/kg/day raised muscle phosphocreatine by 4 to 6% and improved torque by 10 to 23% [10]. The National Institutes of Health Office of Dietary Supplements describes the best-supported use as repeated short bursts of high-intensity effort such as sprinting and weight training, with little value for endurance sport [4].

The Creatinine Question: What Kidney Labs Show on Creatine

The body converts creatine to creatinine, the waste product standard kidney panels measure, so creatine can raise serum creatinine without kidney damage.

The size of that shift is modest. A 2026 meta-analysis of 19 randomized trials plus one crossover study found serum creatinine up by a mean of 0.13 mg/dL (95% CI 0.07 to 0.18) with no difference in urea and no difference in eGFR (mean difference minus 5.20 mL/min/1.73 m2, 95% CI minus 15.00 to 4.60) [2]. A second 2026 analysis of 26 studies and 1,036 people found creatinine up 0.14 mg/dL (95% CI 0.05 to 0.22), creatinine-based GFR down 10.75 mL/min, but GFR measured by Cr-EDTA clearance unchanged at plus 5.89 mL/min (95% CI minus 0.30 to 12.08), with urea, albuminuria and proteinuria all unchanged [3].

Trials that measured filtration directly found no loss. In resistance-trained adults eating at least 1.2 g/kg/day of protein, 12 weeks of creatine (20 g/day for 5 days, then 5 g/day) left 51Cr-EDTA clearance at 101.4 to 108.8 mL/min/1.73 m2 versus 103.3 to 106.7 on placebo (group-by-time p=0.64) [11]. In adults with type 2 diabetes exercising for 12 weeks, 51Cr-EDTA clearance was 90.4 to 96.1 on creatine versus 97.9 to 96.4 on placebo (p=0.58), with proteinuria and albuminuria unchanged [12]. In 18 healthy sedentary men taking about 10 g/day for 3 months with aerobic training, cystatin C, a marker not made from creatine, fell from 0.82 to 0.71 mg/L on creatine and from 0.88 to 0.75 on placebo [13].

The practical point: a creatinine-based eGFR can under-read kidney function in someone taking creatine, so whoever orders and reads kidney tests should know creatine is being used [3].

Kidney disease is the loose end. Few trials enrolled people with existing kidney disease; the 26-study analysis included a hemodialysis subgroup in which serum creatinine rose and urea fell, and long-term safety in advanced kidney disease is not established by these data [3]. Separately, the Depo-Testosterone label lists serious cardiac, hepatic or renal disease among its contraindications and warns that edema, with or without congestive heart failure, can be a serious complication in men with pre-existing cardiac, renal or hepatic disease [1].

Hematocrit and Blood Pressure: The Testosterone Side of the Combination

In a network meta-analysis of 29 placebo-controlled trials in 3,393 men, intramuscular testosterone enanthate and cypionate raised mean hematocrit by 4.0% (95% CI 2.9 to 5.1) versus placebo, compared with 3.0% for gel, 1.4% for patch and 1.6% for intramuscular testosterone undecanoate [7]. A retrospective review of 178 hypogonadal men over 3 years found erythrocytosis (hematocrit above 50%) in 66.7% of men on injectable testosterone, 12.8% on gels and 35.1% on pellets; the injection group was younger with a higher starting hematocrit, and this was not a randomized comparison [14]. The Depo-Testosterone label says to check hemoglobin and hematocrit periodically during long-term use and notes that increased red blood cell mass may raise the risk of thromboembolic events [1].

Blood pressure rises with all testosterone products, class-wide, according to FDA's 2025 labeling action following its ambulatory blood pressure studies [15]. The Depo-Testosterone label warns that testosterone can increase blood pressure, which can increase cardiovascular risk over time, that blood pressure should be measured periodically, and that the products are not recommended in men with uncontrolled hypertension [1].

Does Creatine Raise DHT?

One small study looked at this. Twenty college rugby players took, in a double-blind crossover design, 25 g/day of creatine with glucose for 7 days and then 5 g/day for 14 days. Serum testosterone did not change. DHT rose 56% after the loading week and stayed 40% above baseline after the maintenance phase, and the DHT-to-testosterone ratio rose 36% and then 22% (P<0.001 for DHT) [8].

No hair outcome was measured, so the claim that creatine causes hair loss is unproven [8]. Separately, the Depo-Testosterone label notes that in many tissues testosterone activity appears to depend on reduction to DHT, and it lists male pattern baldness and acne among reported reactions [1].

Doses Studied for Creatine

The NIH Office of Dietary Supplements describes two approaches used in studies: a loading phase of 20 g/day of creatine monohydrate in four 5 g portions for 5 to 7 days followed by 3 to 5 g/day, or about 3 to 6 g/day for 3 to 4 weeks with no loading phase [4]. These are study protocols, not prescriptions. The International Society of Sports Nutrition position stand calls short- and long-term supplementation, up to 30 g/day for 5 years, safe and well tolerated in healthy people and some patient groups, though that is a society position paper rather than a regulator's finding [16].

Creatine monohydrate is 88% creatine by weight and is the most studied form; creatine ethyl ester, alpha-ketoglutarate and buffered forms have not been shown to be better for muscle creatine, digestibility, stability or safety [4].

For comparison, the Depo-Testosterone label describes cypionate as an intramuscular product dosed at 50 to 400 mg every 2 to 4 weeks, with a half-life of about 8 days after injection [1]. Creatine is taken daily in the studied protocols [4].

The consistent creatine effect noted by the Office of Dietary Supplements is weight gain from water retention, roughly 1 to 2 kg in a month alongside strength training [4]. On heat and hydration, a controlled trial gave 12 active men 21.6 g/day of creatine for 7 days, had them lose 2% of body mass, then complete an 80-minute heat test at 33.5 C. Body mass rose 0.88 kg on creatine, and rectal temperature (39.3 versus 39.4 C) and the other thermoregulatory and cardiorespiratory responses did not differ from placebo [17]. The Office of Dietary Supplements notes anecdotal reports of nausea, diarrhea, muscle cramps and heat intolerance, and that adequate hydration may minimize them [4].