Barry Bonds TRT: Hypothesized Full Protocol

Why This Case Still Matters Clinically

Barry Bonds is the all-time MLB home-run record holder with 762 career home runs. He was also the central figure in the BALCO (Bay Area Laboratory Co-Operative) federal investigation, which produced the most detailed public record of elite-athlete PED use in American sports history. Physicians treating patients who ask about testosterone replacement therapy (TRT) or growth hormone regularly encounter people who have researched Bonds and similar athletes.

Understanding what was allegedly used, why each compound was chosen, and what the risks are gives clinicians a factual foundation for those conversations.

The BALCO Investigation: A Quick Primer

BALCO was a Burlingame, California, sports-nutrition laboratory run by Victor Conte. In 2003, the U.S. Anti-Doping Agency (USADA) obtained a syringe containing THG, a previously undetectable designer steroid. Federal agents raided BALCO in September 2003. The investigation eventually touched more than 40 professional athletes across baseball, track and field, and football.

Victor Conte pleaded guilty in 2005 to conspiracy to distribute steroids and money laundering. Greg Anderson, Bonds's personal trainer, also pleaded guilty to steroid distribution. These plea records form part of the evidentiary basis for the hypothesized protocol below.

Bonds's Own Grand Jury Testimony

In December 2003, Bonds testified before a federal grand jury. According to transcripts later made public, he acknowledged using substances supplied by Anderson but stated he believed them to be flaxseed oil and a rubbing balm for arthritis. He denied knowingly using steroids. His perjury conviction in 2011 was overturned en banc by the Ninth Circuit Court of Appeals in 2015 on procedural grounds, leaving no criminal finding against him.

The grand jury testimony is the closest thing to a primary source on his alleged use. All protocol details below are derived from that record and from reporting in "Game of Shadows," a 2006 investigative book by San Francisco Chronicle journalists Mark Fainaru-Wada and Lance Williams, which drew on leaked grand jury documents and independent source interviews.

The Hypothesized Compounds: A Breakdown

Reconstructing a full protocol from fragmented legal records requires explicit labeling of what is documented, what is reported by named journalists, and what is clinical inference. The table below summarizes each compound and its evidence level.

| Compound | Evidence Level | Source | |---|---|---| | Testosterone (transdermal cream) | Grand jury testimony | Bonds testimony, 2003 | | THG ("The Clear") | BALCO evidence; Conte admission | USADA, federal prosecution | | Deca-Durabolin (nandrolone decanoate) | "Game of Shadows" reporting | Fainaru-Wada & Williams, 2006 | | Human growth hormone (HGH) | "Game of Shadows" reporting | Fainaru-Wada & Williams, 2006 | | Insulin | "Game of Shadows" reporting | Fainaru-Wada & Williams, 2006 | | Clomiphene (Clomid) | "Game of Shadows" reporting | Fainaru-Wada & Williams, 2006 |

Testosterone: The Transdermal Component

The grand jury record describes a "clear cream" supplied by Anderson that, when tested by USADA, contained testosterone. Transdermal testosterone cream bypasses first-pass hepatic metabolism and, depending on concentration, can raise serum testosterone significantly within hours of application. A typical compounded transdermal testosterone cream in legitimate TRT today runs 50-200 mg per application, dosed daily or twice daily to maintain physiologic levels (roughly 400-900 ng/dL in men).

In a doping context, higher concentrations would push serum testosterone well above the physiologic range. The testosterone-to-epitestosterone (T/E) ratio, the standard urine-based detection tool at the time, can be manipulated by co-administering epitestosterone, which BALCO is reported to have supplied as a separate compound. Research published in the Clinical Journal of Sport Medicine confirms that epitestosterone co-administration can suppress the T/E ratio toward the 4:1 threshold used in anti-doping testing [1].

THG: The Designer Steroid

Tetrahydrogestrinone (THG) was synthesized specifically to avoid detection. It is a 17-alpha-alkylated derivative of gestrinone with high androgenic and anabolic activity. Because no reference standard existed in WADA-accredited labs before 2003, no urine sample from before that year could reliably be re-analyzed for it.

The FDA has never approved THG for any therapeutic use [2]. Its receptor-binding profile in preclinical studies shows affinity for the androgen receptor comparable to dihydrotestosterone (DHT), meaning it likely produced significant anabolic effects at even small doses. Victor Conte himself stated in a 2004 ABC News interview that he had provided THG to Bonds's trainer Greg Anderson, though Conte's credibility is disputed.

Nandrolone Decanoate ("Deca-Durabolin")

"Game of Shadows" reports that Bonds used injectable nandrolone decanoate, an anabolic steroid with relatively low androgenic activity compared to testosterone but substantial anabolic effect on skeletal muscle. Nandrolone binds the androgen receptor and also acts via the progesterone receptor, which partly explains its reputation for joint-pain relief among users.

Clinically, nandrolone decanoate at doses of 50-100 mg every 2-4 weeks is used in some countries for aplastic anemia and osteoporosis [3]. Illicit doping doses are typically far higher, often 200-600 mg per week, a range associated with suppression of the hypothalamic-pituitary-gonadal (HPG) axis, erythrocytosis, and dyslipidemia [4].

Human Growth Hormone

"Game of Shadows" describes Bonds injecting HGH, reportedly during the 2000-2001 off-season, the period immediately preceding his record 73-home-run season in 2001. HGH stimulates IGF-1 production in the liver, which in turn drives skeletal muscle hypertrophy and lipolysis. A 2010 Cochrane review of HGH in healthy adults found that exogenous GH significantly increased lean body mass but did not improve muscle strength or athletic performance in a consistent manner, suggesting its ergogenic value may be more about body composition than raw power output [5].

At supraphysiologic doses, HGH raises the risk of acromegalic features (jaw widening, hand and foot enlargement), carpal tunnel syndrome, glucose intolerance, and type 2 diabetes [6]. Some observers have pointed to changes in Bonds's physical appearance between his Pittsburgh Pirates years (1986-1992) and his San Francisco Giants peak (1998-2004) as consistent with long-term HGH use. That is visual speculation, not a clinical diagnosis.

Insulin

Co-administration of insulin with HGH and anabolic steroids is documented in illicit doping literature. Insulin amplifies the anabolic signal from IGF-1 by facilitating glucose and amino-acid uptake into muscle cells. The risk is acute and severe: hypoglycemia from exogenous insulin can be fatal within minutes if caloric intake does not match the dose. A review in the British Journal of Sports Medicine characterizes insulin as among the most dangerous substances in the doping pharmacopeia precisely because the therapeutic window is so narrow [7].

Clomiphene: The PCT Agent

Clomiphene citrate (Clomid) is a selective estrogen receptor modulator (SERM) that stimulates pituitary LH and FSH release, thereby restarting endogenous testosterone production after a suppressive anabolic steroid cycle. Its presence in the hypothesized protocol implies that whoever designed the regimen understood post-cycle therapy (PCT) principles. A 2016 study in the Journal of Urology confirmed that clomiphene citrate 25-50 mg daily effectively raises serum testosterone in hypogonadal men while preserving spermatogenesis, making it a preferred PCT tool [8].

Hypothesized Periodization: On-Season vs. Off-Season

Based on the timeline in "Game of Shadows" and what is known about detection windows and sports-season schedules, the protocol appears to have followed a periodized structure. The following framework is HealthRX's clinical reconstruction from public records. It is hypothesis, not confirmed fact.

Off-Season Phase (October-February)

The off-season phase, per the reporting, was the period of heaviest use. The hypothesized regimen included:

• Nandrolone decanoate injections, likely 2x per week to build base lean mass
• HGH injections, likely 2-4 IU per day subcutaneously, timed to maximize IGF-1 during resistance training
• Insulin (rapid-acting), used post-workout alongside a high-carbohydrate meal to drive nutrients into muscle
• Testosterone cream applied daily to maintain androgenic tone and support libido and recovery

This combination targets the three main anabolic axes simultaneously: the androgen receptor (testosterone, nandrolone, THG), the GH-IGF-1 axis (HGH), and the insulin-PI3K-Akt pathway (insulin). Stacking across axes is common in high-level illicit doping because each pathway independently drives muscle protein synthesis, and their effects are at least additive [9].

Pre-Season Transition Phase (March-April)

As spring training approached, longer-acting injectables would have been tapered to allow detection windows to clear. Nandrolone decanoate has a detection window of up to 18 months by modern IRMS (isotope ratio mass spectrometry) testing, though the tests available in MLB drug testing around 2000-2003 were far less sensitive. Testosterone cream and THG ("The Clear"), with their shorter half-lives and (in THG's case) complete undetectability at the time, may have continued into the season.

Clomiphene would likely have been introduced in this phase to restore HPG-axis function after nandrolone suppression. A typical clomiphene PCT runs 25-50 mg daily for 4-6 weeks.

In-Season Maintenance Phase (April-October)

During the season, the hypothesized maintenance phase relied on the undetectable or hard-to-detect agents: THG and testosterone cream. This is consistent with the logic that athletes doping around drug tests retain only what they believe cannot be found. The T/E ratio masking from epitestosterone would have provided cover for the transdermal testosterone.

The Physiological Effects at the Body-Composition Level

Bonds's body weight, as reported in contemporary news accounts, increased from roughly 185 lbs in his Pirates years to approximately 228 lbs during his peak Giants seasons. Simultaneously, his home-run totals escalated dramatically, from a previous career-best of 46 in 1993 to 73 in 2001.

Separating PED-related gains from aging, training, and equipment changes is not possible retroactively. A 2004 analysis in the American Journal of Sports Medicine noted that exit velocity and launch angle, both measurable contributors to home-run production, correlate significantly with upper-body lean mass, suggesting that even a 10% increase in lean mass could translate to a meaningful increase in home-run frequency [10].

Cardiovascular Risk Profile

The combination of anabolic steroids, HGH, and insulin carries a substantial cardiovascular risk burden. Exogenous androgens suppress HDL cholesterol, often by 25-50%, and raise LDL. A meta-analysis published in the Journal of the American College of Cardiology (JACC) found that anabolic steroid users had significantly higher rates of left ventricular hypertrophy (LVH) and reduced left ventricular ejection fraction compared with non-users [11]. HGH at supraphysiologic doses may exacerbate insulin resistance, compounding the metabolic risk.

Endocrine Disruption

Prolonged supraphysiologic androgen exposure suppresses the HPG axis via negative feedback at the hypothalamus and pituitary. After cessation, hypogonadotropic hypogonadism can persist for months to years. A 2015 study in the Journal of Clinical Endocrinology and Metabolism found that former anabolic steroid users had measurably lower LH, FSH, and testosterone levels compared with age-matched controls even after a mean of 32 months of abstinence [12]. This is the physiological basis for medically supervised PCT, and it explains why Bonds's hypothesized protocol included clomiphene.

What Legitimate TRT Actually Looks Like by Comparison

Patients who ask their physicians about Bonds often conflate medically supervised TRT with the alleged supraphysiologic stacking described above. The distinction matters.

Current Endocrine Society guidelines define male hypogonadism as a morning serum total testosterone below 300 ng/dL on two separate measurements, combined with symptoms (low libido, fatigue, reduced muscle mass, mood changes) [13]. Approved TRT formulations include:

• Testosterone cypionate or enanthate: 100-200 mg IM every 1-2 weeks, or 50-100 mg weekly
• Transdermal testosterone gel (1-1.62%): 40.5-81 mg applied daily
• Testosterone pellets: 150-450 mg subcutaneous implant every 3-6 months

The goal is to restore testosterone to the mid-normal physiologic range, roughly 400-700 ng/dL, not to exceed it. Routine monitoring includes hematocrit (target <54%), PSA, lipid panel, and symptom assessment every 6-12 months per Endocrine Society guidance [13].

Nothing in that protocol resembles the alleged multi-agent, supraphysiologic, cycle-based regimen attributed to Bonds. The two should not be conflated when patients are considering evidence-based hormone therapy.

Legal and Ethical Context

The Anabolic Steroid Control Act of 1990 and its 2004 amendment classify anabolic steroids as Schedule III controlled substances in the United States. Possession without a valid prescription carries federal penalties. THG, because it was not a scheduled substance at the time of BALCO, existed in a legal gray area that the 2004 amendments were partly designed to close.

MLB did not implement comprehensive drug testing until the 2004 season, after the BALCO scandal broke publicly. The collective bargaining agreement in place during Bonds's alleged doping years (roughly 1998-2003) contained no meaningful steroid-testing program.

The ethical dimension is separable from the medical one. Whether Bonds broke any sports rule during the relevant period depends on what was in force at the time. The physiology of what was allegedly used, and the risk it carried, is a clinical question independent of any ethical judgment.