Guide 01 — Core science

How liposomes work —
and why it matters

Most nutrients you swallow never reach your cells intact. They are broken down in the stomach, intercepted by the gut wall, or cleared by the liver before entering circulation. Liposomal delivery was developed to solve this problem — and it does so by borrowing a mechanism the body already uses.

The problem with standard supplements

When you swallow a standard supplement capsule, it begins a difficult journey. Stomach acid starts breaking it down immediately. Digestive enzymes attack the active compound further along in the small intestine. Even if the molecule survives to reach the intestinal wall, it faces another barrier: P-glycoprotein and CYP enzymes in the gut lining actively pump foreign compounds back out, and the liver performs a second round of clearance — the so-called first-pass effect — before anything reaches systemic circulation.

For water-soluble nutrients like Vitamin C, there is an additional problem: gut transporters become saturated at relatively low doses (around 200–400mg), meaning that taking more simply leads to more being excreted rather than absorbed.

For fat-soluble nutrients like CoQ10, glutathione, and curcumin, the challenge is different: they are poorly soluble in the watery environment of the gut, so they simply cannot dissolve and disperse well enough to be absorbed efficiently.

The result for many nutrients is that only a small fraction of what you consume actually reaches the tissues that need it.

What a liposome is

A liposome is a tiny spherical vesicle — essentially a microscopic bubble — made from phospholipids: the same fatty molecules that form every cell membrane in your body. The structure is a lipid bilayer: two concentric rings of phospholipid molecules arranged so that their water-repelling tails face inward and their water-attracting heads face outward.

This creates a structure with two distinct compartments: a water-based interior and a lipid membrane. Water-soluble nutrients can be encapsulated inside the aqueous core; fat-soluble nutrients can be embedded within the lipid bilayer itself. Either way, the active compound is shielded from the hostile environment of the digestive tract.

How liposomes reach your cells

Fat-soluble nutrients encapsulated in liposomes are absorbed via the lymphatic system rather than the portal bloodstream — the same route used by dietary fats. Chylomicrons carry them from the gut through lymphatic vessels, eventually entering systemic circulation via the thoracic duct. Critically, this route bypasses the liver entirely, avoiding first-pass clearance.

Once in circulation, liposomes interact with cell membranes in a way that standard supplements cannot: because the liposome's phospholipid bilayer is chemically identical to the cell membrane, the two structures can fuse. The active compound is released directly inside the cell, achieving intracellular concentrations that oral administration of the unencapsulated compound cannot match.

Which nutrients benefit most

Not every nutrient needs liposomal delivery. Some are absorbed efficiently in standard forms. The nutrients that benefit most fall into two categories:

Quality matters: not all liposomes are equal

The term "liposomal" is used loosely in the supplement industry. True liposomal products must form genuine phospholipid bilayer vesicles of an appropriate size (typically 100–400 nanometres) to be absorbed via the lymphatic route. Products that simply mix a nutrient with lecithin powder do not form true liposomes and do not replicate the absorption advantages of properly formulated liposomal preparations.

Relevant quality markers include: verified particle size, phospholipid purity, encapsulation efficiency, and storage stability. Liquid liposomal preparations generally maintain vesicle integrity better than powdered forms.

Guide 02 — Ingredient science

Why form matters —
not all nutrients are equal

The same nutrient can exist in multiple chemical forms — and those forms can have radically different bioavailability, metabolic requirements, and effects in the body. Understanding which form you are buying is one of the most important and least-discussed aspects of supplementation.

Vitamin K2: MK-7 vs MK-4

Vitamin K2 is not a single compound — it is a family of menaquinones, distinguished by the length of their side chain (MK-4, MK-7, MK-8, etc.). The two most common in supplements are MK-4 and MK-7, but they behave very differently in the body.

Vitamin B12: Methylcobalamin vs Cyanocobalamin

Most inexpensive B12 supplements use cyanocobalamin — a synthetic form that must be converted by the body into one of its active forms (methylcobalamin or adenosylcobalamin) before it can be used. This conversion requires functioning enzymes and, critically, is impaired in people who carry variants of the MTHFR gene — estimated to affect up to 40% of people.

Folate: 5-MTHF vs Folic acid

Folic acid is the synthetic form of folate used in most supplements and food fortification. It must be converted by the MTHFR enzyme to 5-methyltetrahydrofolate (5-MTHF) — its bioactive form — before it can participate in the methylation cycle. People with the common MTHFR C677T variant have reduced enzyme activity, meaning folic acid conversion is impaired and unmetabolised folic acid may accumulate.

5-MTHF (also labelled as L-methylfolate or methylfolate) is the active form — it is directly usable by the body without any conversion step. It is the form of choice for anyone seeking optimal folate status, and essential for those with MTHFR variants.

Magnesium: choosing the right form for your goal

Magnesium is available in over a dozen supplement forms — and the differences are significant. The elemental magnesium content and the chelate or salt it is bound to both determine how much is absorbed and where it is most active in the body.

Zinc: Picolinate leads on absorption

Zinc is available as a gluconate, citrate, bisglycinate, picolinate, sulfate, and oxide. The differences in absorption between these forms are meaningful. A direct comparison study found zinc picolinate achieved the highest increase in zinc concentration in hair, urine, and red blood cells compared to zinc citrate and zinc gluconate — suggesting superior cellular uptake via picolinic acid's chelating action.

Guide 03 — Nutrient synergy

The D3+K2+Magnesium stack —
three nutrients, one system

Vitamin D3, Vitamin K2, and Magnesium are three of the most studied nutrients in human physiology — and they happen to be biochemically inseparable. Each one depends on the others to function properly. Understanding how they interact changes how you think about supplementing any one of them.

The three players

How they depend on each other

Magnesium activates Vitamin D

Vitamin D3 is not biologically active when you consume or synthesise it. It must be converted — first in the liver to 25-hydroxyvitamin D (the storage form measured in blood tests), then in the kidneys to 1,25-dihydroxyvitamin D3 (calcitriol, the active hormonal form). Both of these conversion steps require magnesium-dependent enzymes.

A landmark 2018 review in the Journal of the American Osteopathic Association found that all of the enzymes that metabolise Vitamin D appear to require magnesium as a cofactor. This means that someone who is magnesium-deficient — estimated to affect a large proportion of the Western population — may not fully convert supplemental D3 into its active form, regardless of how much they take.

Vitamin D3 raises calcium — K2 directs it

One of Vitamin D3's most important functions is to increase calcium absorption from the intestine — studies suggest it can increase gut calcium absorption by up to 40%. This is well-established and is the basis of D3's role in bone health.

But more calcium in circulation is not inherently safe. Calcium that is not properly directed into bone can deposit in arteries, kidneys, and other soft tissues — a process known as ectopic calcification. This is where Vitamin K2 becomes critical.

Vitamin K2 activates two specific Gla proteins (proteins containing gamma-carboxyglutamic acid residues):

Osteocalcin — produced by osteoblasts in bone, it binds calcium ions into the bone mineral matrix when carboxylated (activated) by K2. Without K2, osteocalcin remains undercarboxylated and cannot bind calcium to bone.

Matrix Gla Protein (MGP) — produced in the vascular wall, it is the most potent known inhibitor of vascular calcification when activated by K2. Without K2, MGP remains inactive and cannot prevent calcium from depositing in arterial walls.

Magnesium and K2 both protect the cardiovascular system

Magnesium's role extends beyond activating Vitamin D. It also regulates calcium channels in smooth muscle cells of the vascular wall, competing with calcium to prevent excessive vasoconstriction. Both magnesium and K2 therefore contribute to cardiovascular health via different but complementary mechanisms — one preventing calcification via Gla protein activation (K2), the other regulating calcium signalling via ion channel competition (magnesium).

Why supplementing one without the others is incomplete

Calcium: the fourth element

Calcium itself is sometimes added as a fourth component. If dietary calcium intake is adequate, additional supplementation is generally not necessary — and some evidence suggests that calcium supplements taken without K2 may increase cardiovascular risk in certain populations, precisely because the calcium lacks directional guidance in the absence of K2. The evidence here is nuanced and debated, but it reinforces the argument for always pairing D3 with K2.

Guide 04 — Regulatory context

EU health claims —
what supplement labels can and cannot tell you

If you have ever noticed that supplement labels in Europe sound oddly cautious — "contributes to normal immune function" rather than "boosts immunity" — there is a specific legal reason. Understanding that reason makes you a better-informed consumer.

What is a health claim?

In the European Union, a health claim is defined as any statement that links a food or nutrient to a health benefit. This includes everything from "Vitamin C supports your immune system" to "calcium helps maintain strong bones." Under EU Regulation (EC) No 1924/2006, these claims are strictly regulated — a food business can only use claims that appear on the EU's authorised list, and must use them verbatim.

The regulation was introduced to protect consumers from misleading marketing and to ensure that every claim on a product is backed by credible scientific evidence. EFSA (the European Food Safety Authority) evaluates submitted claims and provides scientific opinions — the European Commission then decides whether to authorise them.

Why labels say "contributes to" and not "boosts"

The language of EU health claims is precise by design. Authorised claims use careful wording like "contributes to," "supports normal," and "helps maintain" — rather than "boosts," "enhances," "strengthens," or "improves." This is because the authorised claims describe the nutrient's role in normal physiological function in a healthy population, not a therapeutic effect in a diseased or deficient one.

The word "boost" implies taking something above a normal baseline — which would be a medicinal claim and is not permitted for food supplements in the EU. A supplement is a food product, not a medicine, and its claims must reflect that distinction.

Examples of authorised claims

The following are examples of claims currently authorised for use in the EU. These are the exact wordings that may be used on product labels and in marketing:

What "on hold" means for botanicals

Many botanical ingredients — herbs, plant extracts, and fungi — are in a grey zone. When the EU Regulation came into force, thousands of claims for botanical ingredients were submitted. EFSA has not yet evaluated the majority of them. These claims are listed as "on hold" — meaning they can technically be used in some EU member states while awaiting assessment, but they are legally unstable and could be withdrawn at any time.

This is why you may see European supplement brands making quite bold claims for ashwagandha, curcumin, or lion's mane — they are using on-hold botanical claims. This is a legal grey area and individual countries have different enforcement approaches.

Rootwell's approach is to be conservative: for nutrients without authorised claims, all content is framed as mechanism description — explaining what the compound does biochemically — without implying a health benefit that could be interpreted as a claim.

The difference between a mechanism and a claim

This distinction is important and worth understanding clearly:

The Rootwell Academy is built entirely on mechanism descriptions and population data — not health claims. This is not a legal technicality: it is a more honest way to educate consumers about nutrition, because the science of how nutrients work at a cellular level is genuinely more interesting and informative than a marketing claim would be.

How to read a supplement label in Europe

When you see a claim on a European supplement label, a few things are worth knowing:

Authorised claims are reliable starting points. If you see "Vitamin D contributes to normal immune function," you know this has been assessed by EFSA and found to have sufficient scientific support. It tells you D3 is relevant for immunity — not that it will cure anything.

The absence of a claim does not mean the nutrient has no effect. CoQ10 has no authorised EU health claim, but it is one of the most extensively researched compounds in mitochondrial biology. The absence of an authorised claim often reflects the complexity of the evidence or the fact that no manufacturer has funded the approval process — not the absence of science.

Claims on the label must be used verbatim. If a brand modifies the wording of an authorised claim, however slightly, the modified claim is technically not authorised. When in doubt, the EU Register of Nutrition and Health Claims is publicly searchable and lists every authorised claim with its exact approved wording.