Dr. Testosterone
By George Touliatos, MD

Pharmacokinetics of AAS

STEROIDS WITH THE HIGHEST ANDROGENIC INDEX

1. methyltrienolone (6000)     
2. fluoxymesterone (800)
3. trenbolone (500)

STEROIDS WITH THE LOWEST ANDROGENIC INDEX

1. oxandrolone (24)
2. stanozolol (30)
3. nandrolone (37)
4. oxymetholone (45)
5. boldenone (50)
6. methenolone (57)

SLOW-RELEASE INJECTABLE AAS

1. testosterone enanthate
2. testosterone cypionate
3. testosterone undecaonate (per os)
4. testosterone decaonate
5. methenolone enanthate (DHT derivative)
6. trenbolone enanthate (19nor derivative)
7. nandrolone undecaonate (19nor derivative)
8. boldenone undecyclate (testosterone derivative)

IMMEDIATE-RELEASE INJECTABLE AAS

1. stanozolol suspension (DHT derivative)
2. nandrolone phenylpropionate (19nor derivative)
3. testosterone propionate
4. testosterone suspension
5. drostenolone propionate (DHT synthetic)
6. trenbolone acetate (19nor derivative)
7. trenbolone suspension-base (19nor derivative)

AROMATIZED AAS

1. testosterone
2. oxymetholone? (DHT derivative)
3. methyldrostenolone (methyltestosterone derivative)
4. methyltestosterone (testosterone derivative)
5. nandrolone undecaonate (19nor derivative)

NON-AROMATIZED AAS (DHT derivatives)

1. stanozolol
2. oxandrolone
3. mesterolone
4. methenolone
5. fluoxymesterone (testosterone derivative)
6. trenbolone acetate (19nor derivative)
7. drostenolone propionate (DHT synthetic)

The higher androgenic index a steroid has, the more effective is for beta oxidation-lipolysis of the subcutaneous tissue, leading to muscle hardness.

On the other hand, there is a higher reduction rate to dihydrotestosterone, leading to androgenic side effects such as benign prostatic hyperplasia, male pattern baldness-androgenic alopecia, acne, oily skin, body/facial hair growth, aggressive behavior, as well as erythrocytosis.

Anabolic steroids having a lower androgenic index than testosterone can cause a positive nitrogen balance-tissue anabolism and act against catabolism.

Furthermore, the androgenic side effects (acne, hirsutism, neuropsychiatric disorders, prostate enlargement, male-pattern baldness, suppression of the hypothalamic-pituitary-testicular axis) will be less, but always are dose and time dependent.

George Touliatos, MD is an author, lecturer, champion competitive bodybuilder and expert in medical prevention regarding PED use in sports. Dr. Touliatos specializes in medical biopathology and is the medical associate of Orthobiotiki.gr and Medihall.gr, Age Management and Preventive Clinics in Athens, Greece. Heis the author of four Greek books on bodybuilding, has extensively developed articles for www.anabolic.org and is the medical associate for the book Anabolics, 11th Edition (2017). Dr. Touliatos has been a columnist for the Greek editions of MuscleMag and Muscular Development magazines, and has participated in several seminars across Greece and Cyprus, making numerous TV and radio appearances, doing interviews in print and online. His personal website is https://gtoul.com/

Read Dr. Touliatos' book:

Bodybuilding: The Good, The Bad & the Ugly