All of that is discussed in these posts:
skincare ingredients to avoid during pregnancy
skincare ingredients while nursing

A nursing question crossed my mind while reading, I hope that someday you will have time to answer them:
While nursing: Why do you consider Glycolic Acid (AHA) as safe? I was so confused by this, because I thought Glycolic Acid (and every other A-vitamin) was UNSAFE while pregnant AND nursing! Or is specifically Glycolic Acid a ”nicer/safer” A-vitamin? And how about Malic Acid, Mandelic Acid and other acids in the same category A-vitamins), is it just Retinol/retinoid that is unsafe while preg./Nursing, in so: why? When I google ”what is Glycolic acid” all the Swedish answer is ”Glycolic acid is the smallest molecule of all AHA acids”… so this confuses me a lot when you wrote that Glycolic acid is okey while nursing. Could it be other recommendations in Europe? But the fact about the molecule would be the same? Would be SO glad if you had time to answer this.

Sorry if my English isn’t perfect, I’m from Sweden (and bad in English, I think).

I don’t comment on supplements at the request of my malpractice insurer. Please discuss with your physician.

Is it safe to take collagen supplements while breastfeeding?
The ingredients are:
Glycine, Seven Berry Concentrate Powder [Dextrin, Seven Berry Concentrate {Blackberry Concentrate (Germany), Blackcurrant Concentrate (Germany), Blueberry Concentrate, Strawberry Concentrate, Raspberry Concentrate}], DL-Malic Acid, Blueberry Fragrance (Sugar, Synthetic Fragrance), Fruit Mixed Concentrate Powder [Dextrin, Fruit Mixed Concentrate (Israel)], Beetroot Powder, L-Ascorbic Acid, Strawberry Fragrance (Dextrin, Lactose, Synthetic Fragrance, Pectin), L-Proline, Enzymatically Modified Stevia, Silicon Dioxide, Nicotinamide, Hyaluronic Acid Concoction (Dextrin, Hyaluronic Acid), Elastin Hydrolysate (France), Sucralose (Sweetener), Vitamin A Concoction (Dextrin, Arabic Gum, Corn Starch, Vitamin A Acetate Powder, DL-α-Tocopherol), Lactobacillus Mixed Powder, Dried Yeast

Thank you!!

It’s fine for pregnancy and nursing.

You don’t need to worry about them in pregnancy except for the sensitization issues, as it’s a great time for developing allergies or just reacting to ingredients. Some of these (eg- linalool, limonene) are just things found in orange peels.

You need an insane exposure to start worrying about things like cancer from a fragrance ingredient from a topical product. Yes, they’re linked to cancer and other issues, but it’s a link and not a causation. It also takes very high doses you won’t get with a normal product that you’re using correctly.

I wouldn’t worry greatly about these ingredients, but in general I recommend avoiding things that are very fragranced due to the allergy/reaction issues as there’s a much higher risk of that being an issue.

Note, for the same reason but even more so, chose your baby’s skincare products very carefully, they’re super sensitive to fragrances. There’s a well known baby brand (often at Target, the first name is a big state on the west coast…) that has a huge number of fragrances and extracts. Babies will also react with rashes to fragrances in their laundry detergent. Go for a fragrance free product (we use All Free and Clear at my house, Tide also makes a good Free and Clear version) rather than the “baby detergent” that comes in the pink container (it’s a super fragranced product, often grandmas try to buy it for you. Just say no.). I’m trying to be circumspect in my brands to avoid here, but you likely know the ones I mean 🙂

I’d like to hear your thoughts on fragrance as an ingredient. It’s in a lot of my skincare products – some of which are listed as safe for pregnancy on this site – however I’ve read a few articles which state it’s unsafe. Below is a clip from a Byrdie article I recently came across. Please let me know your thoughts. Thanks so much!!

“Fragrances are usually made up of other harmful chemicals, like parabens, benzene derivatives, aldehydes, and more that are linked to cancer and nervous system issues,” says Dendy Engelman, MD. “Short-term, they can cause irritation and redness on the applied area. Look for these terms to clue you in that a product contains a fragrance: parfum, perfume, linalool, limonene, eugenol, citronellol, geraniol, or cinnamal. Fragrance-free products are mostly labeled as so.”

All 3 look ok for pregnancy and nursing