Recombinant Bovine Growth Hormone vs Sodium Sulfite: which is worse?

What is Recombinant Bovine Growth Hormone?

Recombinant bovine growth hormone (rBGH), also called recombinant bovine somatotropin (rBST), is a synthetically produced version of the naturally occurring cattle growth hormone, manufactured using genetically engineered E. coli bacteria. Injected into dairy cows, it increases milk production by 10-15%. It was FDA-approved in 1993 under the brand name Posilac (originally Monsanto, later Elanco).

What is Sodium Sulfite?

Sodium sulfite is an inorganic sulfite salt used as a food preservative and antioxidant. It releases sulfur dioxide when it contacts water or acid, which acts as the active antimicrobial and antioxidant agent. Part of the broader sulfite family of food additives (including sulfur dioxide E220, sodium bisulfite E222, and others).

Documented risks

Recombinant Bovine Growth Hormone: The central human health concern is that rBGH treatment significantly elevates insulin-like growth factor 1 (IGF-1) levels in treated cows' milk. IGF-1 is a naturally occurring growth hormone that promotes cell growth and division. Multiple epidemiological studies have associated elevated blood IGF-1 levels with increased cancer risk in humans. A 1998 study in The Lancet (Hankinson et al.) found that women with the highest IGF-1 blood levels had approximately 7 times the breast cancer risk compared to those with the lowest levels. A 2004 meta-analysis in JNCI (the Journal of the National Cancer Institute) confirmed significant associations between high IGF-1 levels and breast, prostate, and colorectal cancer risk. The mechanistic question is whether consuming rBGH-treated milk raises blood IGF-1 levels in humans. The FDA and WHO/FAO Codex Alimentarius concluded that IGF-1 in milk is a protein largely digested in the GI tract before absorption. Canadian regulatory researchers challenged this, arguing that pasteurization reduces proteases that would otherwise break down IGF-1, potentially allowing more intact IGF-1 to survive digestion. The Codex Alimentarius Commission made history in 1999 by declining to endorse rBST safety maximum residue limits — a split vote (33 in favor of the MRL, 29 against, with abstentions) demonstrating fundamental international disagreement. This is one of very few cases where Codex failed to establish a safety standard. Animal welfare is a second major concern: Health Canada's comprehensive 1999 review found that rBGH-treated cows had 25% higher rates of clinical mastitis, 50% higher lameness risk, increased reproductive problems, and shortened productive lifespans, requiring substantially more antibiotic treatment — an antibiotic resistance concern. Canada rejected rBGH approval in 1999 after its scientific review; the EU banned it in 1999.

Sodium Sulfite: Sulfites are among the more significant food allergy/intolerance triggers. An estimated 1 in 100 people, and up to 5% of asthmatics, are sulfite-sensitive. Reactions can include urticaria, angioedema, bronchospasm, and in severe cases anaphylaxis. Sulfite-induced asthma can be severe; several deaths attributable to sulfite-triggered anaphylaxis have been documented. The FDA banned sulfites from fresh produce and restaurant salad bars in 1986 after several deaths and severe reactions were linked to sulfite-treated salads. FDA mandates that sulfite content above 10 ppm be declared on US food labels. All forms of sulfites (E220-E228) share these sensitization concerns.