The sentence that should not be there

Near the end of The Complete Guide to Peptides for Women, in the FAQ, there is a question: can peptides be used during pregnancy?

The answer begins by saying peptides are generally deemed safe for use during pregnancy. It then adds that you should consult a healthcare provider.

That first statement is not true in any meaningful sense, and in a book that has just spent a hundred pages describing injectable growth factors, hormone modulators and melanocortin agonists, it is the most concerning sentence in it.

"Peptides" is not a single substance. Insulin is a peptide. So is oxytocin, which is used to induce labour. So are the growth hormone releasing compounds in this book, and IGF-1 LR3, a growth factor. Saying "peptides are generally safe in pregnancy" is like saying "chemicals are generally safe in pregnancy". It sounds reassuring and means nothing.

For the vast majority of injectable compounds in this book, there is no human pregnancy safety data at all. The honest answer is: most have never been tested in pregnancy, and anything that alters hormones or growth signals should be assumed unsafe until proven otherwise.

The postpartum stack

This connects to one of the protocols. The book includes a "Postpartum Renewal Stack": topical GHK-Cu, injectable kisspeptin, injectable MOTS-c and oral marine collagen.

The topical and the collagen are low concern. The injectables are a different matter. Kisspeptin directly stimulates the reproductive hormone axis. MOTS-c is an experimental metabolic peptide. Neither has safety data in breastfeeding, and the postpartum stack section does not mention breastfeeding at all. Many women in the postpartum period are breastfeeding. Anything injected may reach breast milk, and nobody has checked whether these do.

Melanotan II, the "Barbie peptide"

The book presents Melanotan II as a way to get a tan without sun, with bonus effects on libido, appetite and fat loss. Its benefits table even lists "skin protection" and "shields against UV damage".

What it does not say clearly enough:

  • Melanotan II is not approved as a medicine anywhere I am aware of. Health regulators in several countries have issued public warnings about it.
  • It stimulates melanocytes, the pigment cells that are also the origin of melanoma. There are published case reports of new moles, changing moles and melanoma in people using it. A tan from Melanotan II is not the same as sun protection, and presenting it as protective is misleading.
  • The book lists "spontaneous penile erections" as a possible side effect, in a book for women. That is a real side effect of Melanotan II in men, and its presence here suggests text was copied from a source written for a different audience without being checked.

Claims that contradict the book's own references

The book cites sources, which is to its credit. But checking them turns up problems.

AOD-9604. The book says it is FDA-approved as a food supplement ingredient in the US. That is not accurate. AOD-9604 is not an FDA-approved drug, and a company's own "generally recognised as safe" determination is not FDA approval. The main reference the book gives for its fat-burning effects is a 2001 study in obese mice. The larger human trials, which the book does not mention, did not show meaningful weight loss compared with placebo, and development as an obesity drug was dropped.

5-Amino-1MQ. The book describes it as a "small molecule inhibitor" in one paragraph and a "small molecule peptide" a few lines later. It is a small molecule, not a peptide. Its fat reduction claims come from mouse studies.

PTD-DBM. As Part 6 noted, the book says it blocks DKK1, while its own cited study is about CXXC5.

PT-141. The "Did You Know" box says it increases libido in women without affecting blood pressure. Two paragraphs earlier, the book correctly says PT-141 has been associated with transient increases in blood pressure. The approved version, bremelanotide, carries that warning on its label.

Contradictions a reader cannot resolve

Beyond references, the book contradicts itself in ways that would genuinely confuse someone trying to follow it:

  • Copper peptides and vitamin C. One caution box says avoid mixing copper peptides with strong acids like vitamin C. The paragraph right after recommends combining them.
  • Copper peptides and retinol timing. One section says apply copper peptides at night. Another says apply them in the morning and retinoids at night.
  • Collagen dose. 10 to 20 grams, then 5 to 10 grams, then 2.5 grams, then 10 grams (see Part 5).
  • IGF-1 LR3 dose. 20 to 120 micrograms in one place, 20 to 100 in another, 20 to 40 in a third.
  • CJC-1295 without DAC. In the workout stack, the book says to take it "biweekly" at 2,000 to 3,000 micrograms, which matches how the long-acting DAC version is sometimes described, not the short-acting version it names.

When dosing numbers for an injectable growth factor vary threefold within the same book, the problem is not the reader.

Mechanisms that go further than the science

Some broad claims in the early chapters are simply overstated. The book says peptides, once inside the cell, can interact with genetic material in the nucleus to change gene expression, and presents this as a general property. Most peptide hormones work by binding receptors on the cell surface and never enter the nucleus. It also says peptides that act on oestrogen and progesterone pathways can help menopausal symptoms, without naming any.

The prose itself

Finally, a quieter point. Large parts of this book are written in a padded, formal style, with sentences ending on uplifting phrases about your "journey" or "empowerment", and paragraphs that repeat the same point in slightly different words. That style is consistent with text generated in bulk and lightly edited. It matters because it helps explain the contradictions: sections appear to have been produced separately and never reconciled.

The steelman

To be fair: the cosmetic peptide sections are mostly reasonable, the collagen section is supported by solid meta-analyses, the book cites real research, and it repeatedly says to consult a professional, start low and go one at a time. For a reader using it as a guide to skincare ingredients, it is serviceable.

The takeaway

Use the cosmetic half of this book as a starting point for learning. Treat the injectable half as unverified, and in places unsafe. And if you are pregnant, trying to conceive or breastfeeding, disregard the book's pregnancy answer entirely and ask your own doctor or midwife about any product, topical or otherwise, before you use it.

This series reviews a consumer book, not a clinical guideline. Many injectable compounds it discusses are not approved for human use in most countries. Nothing here is medical advice. If you are pregnant, breastfeeding or have a medical condition, speak to your doctor before using any product.