Quick Verdict
The Most Scientifically Grounded Organ Supplement We've Reviewed
Heart & Soil Skin, Hair & Nails gets the fundamentals right. Unlike reproductive organ claims built on the unvalidated "like supports like" principle, collagen supplementation for skin, hair, and nails has genuine clinical evidence — multiple meta-analyses show oral collagen improves skin elasticity and hydration. The formula delivers 1,200mg of bovine cartilage (providing collagen types I through V and XI), 1,200mg of bone marrow, and 600mg of liver — all with full dose disclosure. New Zealand regenerative sourcing, freeze-dried processing, and glass bottle packaging add to a quality profile. The catch: at $59/month, you're paying a significant premium over conventional collagen peptide powders that deliver higher raw collagen doses for $15–25/month. The value proposition is whole-tissue nutrition and broader collagen types, not collagen volume.
Key Strengths
- Full dose transparency — every amount disclosed
- Collagen for skin/hair has real clinical evidence
- Broader collagen type profile (I–V, XI) vs. peptide powders
- NZ regenerative sourcing, freeze-dried, glass packaging
Key Concerns
- $59/month is 2–4x the cost of collagen peptide powders
- 1,200mg cartilage is below the 2,000–10,000mg used in clinical collagen studies
- Prop 65 PFAS allegation filed Nov 2025
- No product-specific clinical trials
Best For: Health Goal Ratings
Based on Heart & Soil Skin, Hair & Nails's specific ingredients, doses, and clinical evidence, here's how the formula maps to common health goals. Only goals supported by ingredients in the formula are rated.
Health goal ratings are derived from the specific ingredients, doses, and clinical evidence in this product's formula. They reflect formula suitability for each goal — not guaranteed outcomes. A high rating means the formula contains clinically-relevant ingredients at meaningful doses for that goal. Always consult a healthcare provider for specific health conditions.
What Is Heart & Soil Skin, Hair & Nails?
Heart & Soil Skin, Hair & Nails is a beauty-focused beef organ supplement designed to support collagen formation, skin health, hair growth, and nail strength. It's part of the Heart & Soil product line founded by Dr. Paul Saladino, MD — a board-certified psychiatrist and prominent advocate of the animal-based diet movement.
Unlike many female-specific organ supplements that rely on reproductive organs and the unvalidated "like supports like" principle, this product takes a different approach: it targets beauty outcomes through collagen-rich tissues. The formula centers on bovine cartilage and bone marrow — both legitimate sources of collagen and related connective tissue nutrients — supported by liver for its vitamin A (retinol) and biotin content.
The product comes in a glass bottle containing 180 capsules (a 30-day supply at 6 capsules per day). All organs are sourced from 100% grass-fed, grass-finished regenerative cattle in New Zealand, freeze-dried to preserve nutrient integrity. Heart & Soil is Informed Sport certified and uses no fillers, stearates, lubricants, or binders.
Unlike many organ supplements that hide behind proprietary blends, Heart & Soil discloses exactly how much of each ingredient you're getting: 1,200mg cartilage, 1,200mg bone marrow, 600mg liver. This is how supplement labels should work — and it's increasingly rare in the beef organ category. We also reviewed Heart & Soil's Mood, Memory & Brain formula, which shares this transparency standard.
Ingredient Analysis
Heart & Soil Skin, Hair & Nails contains three beef organ ingredients with fully disclosed amounts. The total daily dose is 3,000mg — a meaningful quantity that puts it in a different league from two-capsule products trying to pack in six organs.
The Collagen-Focused Approach
The core insight here is simple: if you want to support skin, hair, and nails, target collagen. Bovine cartilage is one of the richest natural sources of multiple collagen types. Rather than spreading tiny amounts across reproductive organs with no evidence base, this formula concentrates on tissues with a direct, documented connection to the claimed benefits.
Ingredient Breakdown
| Ingredient | Key Benefits | Clinical Dose Range | Heart & Soil Dose | Verdict |
|---|---|---|---|---|
| Bovine Cartilage (NZ Grass-Fed) | Collagen types I–V & XI, chondroitin sulfates, glucosamine, bioactive peptides | 2,000–10,000 mg/day (collagen) | 1,200 mg | Solid — below clinical range but whole-tissue with multiple types |
| Bone Marrow (NZ Grass-Fed) | Additional collagen, fatty acids, alkylglycerols, stem cell factors | No established dose | 1,200 mg | Generous — adds collagen + unique fatty acids |
| Beef Liver (NZ Grass-Fed) | Retinol (Vitamin A), biotin, B12, folate, iron, copper | 3,000–6,000 mg/day | ⚠ 600 mg | Supporting role — 10–20% of effective liver dose, but retinol/biotin relevant at lower amounts |
Analysis Notes
Cartilage (1,200mg): This is the star of the formula. Bovine cartilage provides a broader collagen type profile than hydrolyzed collagen peptide supplements. Most collagen powders deliver predominantly type I collagen. Cartilage provides types I, II, III, V, and XI — each with distinct roles in skin structure, joint health, and connective tissue integrity. It also naturally contains chondroitin sulfates and glucosamine, which support skin hydration and joint function. The 1,200mg dose falls below the 2,000–10,000mg range used in clinical collagen studies, but this is whole-tissue collagen (not isolated peptides), which may have different bioavailability dynamics.
Bone Marrow (1,200mg): A generous dose that adds real value. Bone marrow provides additional collagen, essential fatty acids, and alkylglycerols — lipid compounds that support immune function and have been studied for skin health benefits. It's also a source of adiponectin and other growth factors. At 1,200mg, this isn't a token inclusion.
Liver (600mg): The supporting cast, and smartly chosen. At 600mg, this is well below the 3,000–6,000mg range for standalone liver supplementation. But the inclusion makes sense: liver is the most concentrated natural source of preformed vitamin A (retinol) and biotin — both directly relevant to skin, hair, and nail health. You don't need 3,000mg of liver to get meaningful retinol and biotin. This is a nutrient-targeted inclusion rather than an attempt at full liver supplementation.
Does It Work? Clinical Evidence
This is where Heart & Soil Skin, Hair & Nails separates itself from most organ supplements we've reviewed. While no product-specific clinical trial exists, the ingredient-level evidence for collagen supplementation is genuinely strong.
What the Research Shows
- Skin elasticity and hydration. A 2019 systematic review in the Journal of Drugs in Dermatology found that oral collagen supplementation significantly improved skin elasticity, hydration, and dermal collagen density. These are objective, measurable outcomes — not self-reported satisfaction scores.
- Hair growth. While less extensively studied than skin, preliminary research suggests collagen peptides may support hair follicle health by providing amino acids (proline, glycine, hydroxyproline) essential for keratin production.
- Nail strength. A 2017 study in the Journal of Cosmetic Dermatology found that bioactive collagen peptides improved nail growth rate by 12% and decreased broken nails by 42% after 24 weeks of supplementation.
- Chondroitin sulfates for skin. Research published in Nutraceuticals for Skin Care reviews note that chondroitin sulfates (naturally present in cartilage) support skin hydration by helping retain water in the dermal matrix.
Important Caveats
- No product-specific study. Heart & Soil has not conducted a clinical trial on this specific formula. The evidence applies to collagen supplementation generally, not this product specifically.
- Dose gap. Most clinical studies use 2,000–10,000mg of collagen peptides. This product provides 1,200mg of whole cartilage (not isolated collagen peptides). The collagen content of cartilage tissue is roughly 60–70%, meaning you're getting approximately 720–840mg of actual collagen from the cartilage component, plus additional collagen from bone marrow. Total collagen intake is likely in the 1,000–1,500mg range — below most study doses.
- Whole tissue vs. hydrolyzed peptides. Most clinical evidence uses hydrolyzed collagen peptides, which are broken down for easier absorption. Whole-tissue cartilage contains intact collagen fibers that require more digestive processing. Whether this difference matters clinically is not well-established.
The bottom line: the underlying science for collagen supplementation is real and supported by multiple meta-analyses. This is a meaningful step above "like supports like." But the product-specific dose falls below clinical study ranges, and whole-tissue delivery differs from the hydrolyzed peptides used in most research.
Side Effects & Safety Concerns
Based on customer reviews, Reddit discussions, and Trustpilot feedback, Heart & Soil Skin, Hair & Nails has a relatively clean side effect profile compared to other organ supplements we've reviewed.
Reported Side Effects
- Initial digestive adjustment — Some users report mild nausea or bloating when first starting, particularly if they jump straight to the full 6-capsule dose. Heart & Soil recommends starting with 1–2 capsules and gradually increasing, which appears to mitigate this for most people.
- Sleepiness/heaviness after first dose — A small number of users report feeling heavy-eyed or sleepy initially, possibly related to the high nutrient density or an adaptation response.
- Skin purging — Some users report temporary skin breakouts in the first few weeks before improvement. This is consistent with retinol-driven skin turnover (the liver component provides vitamin A).
The Prop 65 / PFAS Question
The Environmental Research Center (ERC) filed a Prop 65 notice of violation against Heart & Soil in November 2025 alleging PFAS (per- and polyfluoroalkyl substances) in their products. This is worth noting, but context matters: ERC has filed similar notices against hundreds of supplement and food brands. A notice of violation is an allegation, not a finding of contamination. No test results have been made public. Heart & Soil is Informed Sport certified, which requires third-party testing for contaminants. We'll update this review if test results or a settlement are published.
Those with existing vitamin A toxicity concerns or taking retinol-based medications (the liver component is high in preformed vitamin A), anyone with iron overload conditions (liver contains heme iron), pregnant or nursing women (insufficient safety data on this specific product), and anyone with known beef allergies.
What Customers Are Actually Saying
Heart & Soil Skin, Hair & Nails has 341 reviews on Amazon with a 4.4/5 rating. The brand also claims over 154,000 happy customers across their entire product line. Here's what we found across Amazon, Trustpilot, and Reddit.
Positive Themes
- Hair and nail growth — The most consistently cited benefit. "Major growth and strength in my nails and my skin is definitely clearer" is a representative review. Multiple users report visible hair thickness improvements within 1–2 months.
- Skin clarity and texture — Many users report clearer, more hydrated skin. "My hair and nails feel and look better, thicker, stronger after only one month" (Jaclyn F., Heart & Soil site).
- Energy boost — Though not a primary marketed benefit, several users report improved energy, likely from the liver component's B12 and iron content.
- Clean ingredient list — Users frequently praise the transparency, sourcing quality, and lack of fillers. The glass packaging is specifically called out as a plus.
Negative Themes
- Price sensitivity — At $59/bottle, cost is the most common complaint. Several reviewers acknowledge the product works but question whether the results justify the price premium over cheaper collagen options.
- Slow results — Some users report needing 2–3 months to see noticeable changes, which is consistent with collagen supplementation timelines in clinical research.
- Delivery issues — A small number of Trustpilot reviews mention shipping delays, though this appears to be an occasional logistics issue rather than a systemic problem.
- Capsule count — Taking 6 capsules daily is a common objection. Some users find it excessive compared to 1–2 capsule competitors (though those competitors can't deliver meaningful doses in fewer capsules).
Pricing & Value Analysis
At $59 per month (or ~$50–53 on subscription), Heart & Soil Skin, Hair & Nails is positioned as a premium supplement. To put that in context: a quality hydrolyzed collagen peptide powder like Vital Proteins or Sports Research costs $15–25 per month and delivers 10–20g of collagen per serving — roughly 10–20x more raw collagen per dollar.
The counterargument is that Heart & Soil isn't selling isolated collagen — it's selling whole-tissue nutrition. The bovine cartilage provides a broader collagen type profile (types I–V and XI vs. mostly type I), the bone marrow adds fatty acids and alkylglycerols, and the liver contributes retinol and biotin. Whether that broader nutritional profile is worth the 2–4x price premium depends on how you value whole-food supplementation versus targeted nutrient isolation.
Compared to other Heart & Soil products, this is the most affordable in the line. Their Mood, Memory & Brain formula retails for $66–84 per month.
If you're primarily seeking collagen for skin and hair, conventional collagen peptide powders deliver more collagen per dollar. If you want whole-tissue organ nutrition with collagen as the centerpiece — plus the sourcing and processing quality Heart & Soil offers — this product delivers real value within the organ supplement category. It's premium, but you can see where the money goes.
Heart & Soil vs. Alternatives
How does Heart & Soil Skin, Hair & Nails compare to other collagen-focused options and organ supplement competitors?
| Feature | Heart & Soil Skin, Hair & Nails | Collagen Peptide Powder (e.g., Vital Proteins) | Ancestral Supplements Bone Marrow |
|---|---|---|---|
| Price (Monthly) | $59 ($50–53 sub) | $15–25 | $38–45 |
| Collagen Types | Types I–V, XI | Mostly Type I | Types I, III |
| Collagen Dose | ~1,000–1,500 mg total | 10,000–20,000 mg | ~500–1,000 mg |
| Ingredient Transparency | Fully disclosed | Fully disclosed | Fully disclosed |
| Sourcing | NZ Grass-fed, Regenerative | Varies by brand | NZ Grass-fed |
| Additional Nutrients | Retinol, biotin, fatty acids, chondroitin | Pure collagen | Fatty acids, alkylglycerols |
| Clinical Evidence (Ingredient-Level) | Strong for collagen | Strong for collagen | Limited |
| Format | 6 capsules/day | 1 scoop powder | 6 capsules/day |
| Our Rating | 7.5/10 | N/A (category) | 7.5/10 |
The comparison tells a clear story: conventional collagen peptide powders deliver more raw collagen per dollar, with strong clinical backing. Heart & Soil's advantage is whole-tissue nutrition — a broader collagen type profile plus supporting nutrients from bone marrow and liver. Ancestral Supplements Bone Marrow is a credible alternative at a lower price point, with the same transparency and sourcing standards but a more focused formula.
Full Pros & Cons
Pros
- Full dose transparency — every ingredient amount disclosed
- Collagen supplementation for skin/hair/nails has genuine clinical evidence (meta-analyses)
- Broader collagen type profile (I–V, XI) than hydrolyzed collagen peptides (mostly type I)
- 1,200mg bone marrow adds unique fatty acids, alkylglycerols, and additional collagen
- Liver inclusion provides retinol and biotin — directly relevant to skin/hair health
- NZ regenerative sourcing, freeze-dried processing, Informed Sport certified
- Glass bottle packaging (avoids plastic leaching concerns)
- Relatively clean side effect profile based on customer reports
Cons
- $59/month is 2–4x the cost of conventional collagen peptide powders ($15–25/month)
- 1,200mg cartilage delivers ~720–840mg collagen — below the 2,000–10,000mg used in clinical studies
- No product-specific clinical trial — evidence is ingredient-level
- Whole-tissue cartilage may have different bioavailability than hydrolyzed peptides used in research
- Prop 65 PFAS allegation filed against Heart & Soil (Nov 2025)
- 600mg liver is a fraction of the effective standalone liver dose
- 6 capsules per day is a lot for some users
- Results take 2–3 months for most users
Frequently Asked Questions
There is genuine scientific evidence that oral collagen supplementation improves skin elasticity, hydration, and nail growth. Multiple meta-analyses support these outcomes. Heart & Soil's formula provides 1,200mg of bovine cartilage (collagen types I–V and XI) plus 1,200mg of bone marrow with additional collagen and fatty acids. While the total collagen dose (~1,000–1,500mg) falls below the 2,000–10,000mg range used in clinical studies, users consistently report improvements in hair growth, nail strength, and skin quality — typically after 1–3 months of use. The results are consistent with what you'd expect from a moderate collagen supplement with supporting nutrients.
Side effects are relatively uncommon. The most frequently reported are mild digestive adjustment (nausea, bloating) when starting at the full 6-capsule dose — Heart & Soil recommends ramping up gradually. Some users experience temporary skin purging in the first few weeks, consistent with retinol-driven skin turnover from the liver component. A small number report initial sleepiness. The side effect profile is notably milder than organ supplements containing reproductive tissues, which can cause hormonal disruption. If you're already taking vitamin A supplements, be mindful of your total retinol intake.
It depends on what you're optimizing for. Conventional collagen peptide powders (Vital Proteins, Sports Research, etc.) cost $15–25/month and deliver 10–20g of hydrolyzed collagen — mostly type I, engineered for maximum absorption. Heart & Soil costs $59/month for ~1,000–1,500mg of whole-tissue collagen across types I–V and XI, plus bone marrow fatty acids, alkylglycerols, retinol, and biotin. If raw collagen dose per dollar is your metric, peptide powders win decisively. If you value whole-food organ nutrition, a broader collagen type matrix, and the supporting nutrients from bone marrow and liver, Heart & Soil offers something peptide powders can't replicate. Many users combine both: a collagen powder for baseline dosing and Heart & Soil for the whole-tissue nutrition layer.
The formula contains three ingredients, all fully disclosed: New Zealand Grass-Fed Bovine Cartilage (1,200mg) — sourced from trachea and scapula, providing collagen types I through V and XI, chondroitin sulfates, glucosamine, and bioactive peptides; New Zealand Grass-Fed Bone Marrow (1,200mg) — providing additional collagen, fatty acids, alkylglycerols, and immune-supporting compounds; and New Zealand Grass-Fed Liver (600mg) — providing retinol (vitamin A), biotin, B12, folate, iron, and copper. Total daily dose: 3,000mg. The only other ingredient is bovine gelatin (capsule material). No fillers, stearates, lubricants, or binders. All sourced from regenerative, 100% grass-fed, grass-finished cattle.
At $59/month ($50–53 on subscription), this is a premium product. The value depends on what you're comparing it to. Against other beef organ supplements, it's competitive — Ancestral Supplements products are in the $38–68 range, and Heart & Soil's sourcing, transparency, and formulation quality justify a premium. Against conventional collagen peptide powders at $15–25/month, the math is harder: you're paying 2–4x more for roughly one-tenth the raw collagen dose, but with a broader collagen type profile and additional whole-tissue nutrients. If budget is a primary concern, a quality collagen peptide powder gives you more collagen per dollar. If you value whole-food organ nutrition, NZ regenerative sourcing, and the broader nutritional matrix, Heart & Soil is one of the best options in the category.
Our Final Verdict
Heart & Soil Skin, Hair & Nails is the most scientifically grounded beef organ supplement we've reviewed in this roundup. The formula makes genuine sense: collagen supplementation for skin, hair, and nails has real clinical evidence — meta-analyses, not brand-funded satisfaction surveys. Bovine cartilage provides a broader collagen type profile than conventional peptide powders. Bone marrow adds meaningful fatty acids and additional collagen. Liver contributes retinol and biotin directly relevant to the claimed benefits.
Full dose transparency, New Zealand regenerative sourcing, freeze-dried processing, Informed Sport certification, and glass packaging all earn high marks. This is a product where you can see exactly what you're getting and where it comes from.
The limitations are real but straightforward: the collagen dose (~1,000–1,500mg total) falls below clinical study ranges (2,000–10,000mg), and the $59/month price is 2–4x what conventional collagen powders cost. The Prop 65 PFAS allegation deserves monitoring but isn't confirmed contamination.
We land at 7.5 out of 10. This is a quality product with genuine science behind its core mechanism, honest labeling, and premium sourcing. The main question isn't whether it works — it's whether the whole-tissue approach justifies the price premium over conventional collagen. For those who value organ-based, whole-food supplementation with full transparency, Heart & Soil Skin, Hair & Nails earns a recommendation.
For comparison, see our review of Heart & Soil Mood, Memory & Brain, which shares the same quality standards but targets cognitive function.