Which Studies Tested Which TB-500 Dosage Amounts?

What can the study amounts tell you?

Scientists studying Thymosin Beta-4 and TB-500 chose amounts for particular experiments. Tiny amounts went into tests of cells growing in dishes. Animal injury experiments used larger amounts, often based on body weight. The early human trials delivered the complete protein by vein. Those study amounts reached grams, far above the tiny cell-test amounts.

These experiments haven't established a dose for your injury.

No human dose has been proved for the TB-500 piece. Below, each amount belongs to the person or animal actually tested. Later sections explain what is known about leaving the body. Your body may handle a compound differently from a rat's body.

Which TB-500 Study Amounts Have Been Published?

TB-500 dosage figures answer different questions in different experiments. A dish of cells and a living rat need different amounts. Your TB-500 treatment cannot be worked out from the entries below.

Malinda, rat wounds, 1999: Cell movement tests used 10 picograms. A trillion picograms have the weight of one gram. Wound treatment went onto skin or into the belly cavity. The belly cavity is the space around the organs.

Xu, rat knee ligament, 2013: The injury received 1 microgram in glue that seals tissue. A million micrograms have the weight of one gram.

Philp, hair roots, 2004: Studies used very small amounts in rats and mice. Other tests examined cells growing in dishes.

Spurney, muscle disease, 2010: Mice lacked a protein that normally supports muscle. Researchers gave 150 micrograms into the belly cavity. Treatment was twice weekly for 6 months.

Zhu, fatty liver, 2025: Mice received 12 milligrams daily per kilogram of the mouse's weight. Shots went into the belly cavity, around the organs.

Ruff, healthy volunteers, 2010: Researchers enrolled 40 people to check for harm. Single doses through a vein were 42, 140, 420 and 1260 milligrams. One gram contains a thousand milligrams. Repeat treatment was tested for 14 days as well.

Wang, healthy Chinese volunteers, 2021: Researchers enrolled 40 people and tested larger and larger amounts of the complete protein. This study's published account describes treatment through a vein. The brief amount summary didn't state that detail again.

Sosne, dry eyes, 2015: A Phase 2 trial, an early patient test of benefit and harm, tested 9 patients. The eye drops contained 0.1% of the whole protein. Treatment was 6 times daily for 28 days.

The numbers describe experiments, rather than a dose for you.

Differences in body size and how compounds leave the body matter. Scientists haven't established a reliable human dose for TB-500. The figures above cannot settle how much a person would need.

What Does TB-500 Research Say About Time Between Treatments?

Researchers chose treatment times for each animal and type of injury. Those treatment times aren't proved choices for your own injury.

• Wound tests used one treatment or short courses lasting days to 2 weeks.
• Spurney's 2010 experiment gave mice 150 micrograms ^[16]. Belly-cavity shots were twice weekly for 6 months.
• The fatty liver experiment tested daily belly-cavity shots ^[21]. Mice received 12 milligrams each day per kilogram of the mouse's weight.
• Ruff's 2010 safety trial gave daily treatment through a vein for a 14-day course ^[9]. Other volunteers received a single dose.

TB-500 has no proved human schedule for muscle, heart or brain repair. Neither has Thymosin Beta-4 been proved for those human uses.

The dry-eye study gave 0.1% Thymosin Beta-4 drops 6 times daily for 28 days. Those results concern eye treatment, rather than repair throughout your body. Sosne's eye paper is separate from the rat brain study ^[8].

People experimenting outside formal trials mention treatment 2–3 times weekly. Their accounts haven't established a schedule checked in a human comparison study.

How Quickly Does TB-500 Leave the Blood?

TB-500 is a 7-residue piece, meaning seven amino acids joined together. Published human research hasn't established how quickly this copied fragment leaves the blood. Ho's 2012 horse study checked a test for detecting TB-500 ^[12]. The test found tiny amounts in urine and liquid taken from blood. The test didn't measure the time for blood amounts to halve.

Finding the drug doesn't tell you when the drug has gone.

Ruff's 2010 trial instead gave Thymosin Beta-4 through a vein ^[9]. Blood amounts rose as study doses increased from 42–1260 milligrams. Higher doses took longer to fall to half their starting level. The brief published account didn't give those exact times. That account doesn't establish timing for the copied piece.

Wang's 2021 trial found no buildup after repeated treatment ^[10]. Those people received Thymosin Beta-4, the whole 43-amino-acid protein. Their results cannot establish timing for the 7-residue piece, meaning seven joined amino acids.

Your body may handle the smaller compound differently.

Dry TB-500 powder resists change before researchers mix the powder with liquid. That finding doesn't prove safety or give a shared storage time. Studies describe germ-free salt water or water containing a substance that slows bacterial growth. Those mixtures were tested in animal experiments. In 2025, Nguyen's group joined two copies of the whole protein ^[20]. Short time in the body was one reason for making that longer form.

Where Did the Compound Go in Each Experiment?

The place treatment entered the body depended on the study question. These findings describe research methods, rather than a treatment for your injury.

Inside the belly cavity: This is the space around the organs, not inside an organ. Many rat and mouse experiments delivered treatment into that space. Mice with muscle disease received 150 micrograms this way ^[16]. Fatty liver experiments gave 12 milligrams daily per kilogram of the mouse's weight ^[21]. Heart researchers also tested material carried by a virus in this setting ^[5].

On the skin or eye: Rat wound experiments put treatment on the skin ^[2]. They also tested shots into the belly cavity. Dry-eye researchers tested 0.1% drops 6 times daily. This was a Phase 2 trial, an early patient test of benefit and harm. Sosne's eye paper is separate from the rat brain paper ^[8].

At an injured ligament: Thymosin Beta-4 went directly into an injured knee ligament's gap ^[3]. Researchers put 1 microgram in glue that seals tissue. This kept treatment near the wound instead of spreading widely.

Through a vein: Both early human trials gave whole Thymosin Beta-4 this way ^[9][10]. Published human results about handling the protein concern this vein treatment.

Under the skin: The horse drug-test work examined samples after shots beneath the skin ^[12].

Swallowed TB-500 hasn't been shown to reach the blood in useful amounts. Stomach acid and enzymes, substances that break food down, can break the copied fragment apart. Published studies haven't shown enough entering the blood after swallowing TB-500 or Thymosin Beta-4.

Can a Swallowed Compound Reach Injured Tissue?

Early experiments mostly delivered treatment through shots or onto skin and eyes. Shots went under skin, into muscle, around belly organs or through veins. Stomach acid and enzymes, which help digest food, can break protein pieces apart. A swallowed piece may therefore fail to reach the blood.

Swallowing TB-500 needs evidence that enough reaches the blood.

Published studies haven't shown enough TB-500 entering the blood after swallowing in any animal or person. People outside trials describe swallowing the 7-amino-acid piece. Those personal accounts don't establish how much reaches damaged tissue.

Nguyen's 2025 work used bacteria to make a joined protein ^[20]. Bacteria served as a manufacturing tool, rather than a treatment ingredient. Researchers wanted to lower costs, not improve entry through the stomach. The experiment applied the protein to the eye's clear front surface.

What Do Powder Experiments Leave Unknown?

Animal researchers mixed dry TB-500 and Thymosin Beta-4 with liquid. Studies describe germ-free salt water or water that slows bacterial growth. How long mixtures stayed unchanged differed with the study and amount. Unchanged material isn't proof that a mixture is safe for people.

Animal mixtures don't establish a medical method for your treatment.

Ho's 2012 experiment prepared known samples for a horse drug test ^[12]. The researchers checked samples using horse blood and urine. This lab work established testing details, not a method of making human shots. There's no agreed medical mixing guide for treating people.

When Did the Animals Show Repair Changes?

Rat skin wounds showed the clearest early timing changes. New skin coverage improved 42% by day 4. The improvement was 61% by day 7 ^[2]. These animal timings cannot predict when your skin would heal.

Other injuries were checked using different tests:

• Rat ligaments looked more even and tested stronger after 4 weeks ^[3].
• Mouse heart experiments checked early cell survival over days ^[4][5]. Later tests examined heart function and scarring over weeks.
• More vessels appeared in injured rat brains after 35 days ^[8].

Each timing describes one injury in a particular experiment.

Human studies haven't shown when TB-500 would begin helping an injury. Whole Thymosin Beta-4 lacks that proof for muscle, heart or brain repair too.

When Would a TB-500 Drug Test Turn Negative?

Human studies haven't established how the body handles TB-500 itself. The early trials gave the whole Thymosin Beta-4 protein through a vein ^[9][10]. Blood amounts rose with dose, without buildup during 14-day repeat treatment. Study amounts ranged from 42–1260 milligrams. The brief accounts didn't state exact times for blood levels to halve.

Those people weren't tested for how fast the smaller piece disappeared.

Horse drug tests found very small amounts of TB-500 ^[12]. Human research hasn't established how long a drug test could stay positive. At least one athlete received a Canadian Centre for Ethics in Sport sanction. The sanction involved TB-500 and shows testing has consequences. A published paper hasn't fully described the testing method used in people. Your test result cannot be predicted from the horse experiment.