Protandim (Nrf2 Activator Blend).

Nrf2 activation raises expression of glutamate-cysteine ligase, the rate-setting enzyme for glutathione synthesis, while NAC supplies the cysteine that enzyme is limited by. One raises the machinery and the other the raw material.

Nrf2 signalling raises glutathione peroxidase expression, and every glutathione peroxidase carries a selenocysteine at its active site. Selenium status determines how much of that induced enzyme is functional.

Glutathione reductase is an FAD enzyme that returns oxidised glutathione to its reduced form. Riboflavin keeps that recycling step running as glutathione turnover rises.

Glutathione is a tripeptide of glutamate, cysteine and glycine, and glycine availability can limit the final synthetic step. Adding it covers the residue that cysteine donors do not.

Lipoic acid also signals through Nrf2 and separately regenerates reduced glutathione through the dihydrolipoate couple. It acts on the same axis by a second route.

Piperine slows intestinal glucuronidation, which is the main clearance route for the curcuminoid content of this blend. Exposure to that constituent rises when the two are taken together.

Sulforaphane modifies the same Keap1 cysteines that this blend's constituents act on to release Nrf2. Combining them stacks on one pathway rather than adding a second, so gains are overlapping.

Silymarin is one of the botanical constituents of this blend. Taking a separate silymarin product adds to the same intake rather than contributing something new.

Curcumin carries electrophilic Michael-acceptor carbons that react with sensor cysteines on Keap1, the protein that otherwise marks Nrf2 for degradation. That is the same chemistry the blend as a whole is built on. Adding standalone curcumin on top of the blend increases total intake of one component rather than adding a new mechanism.

EGCG oxidises to quinone species that modify reactive cysteines on Keap1, releasing Nrf2 to move to the nucleus. It also acts as a direct radical scavenger, so its contribution is dual. Concentrated catechin extracts have their own upper-intake cautions, and stacking a separate extract on the blend raises the daily catechin total.

Withaferin A and related withanolides carry reactive enone groups that modify Keap1 cysteines, which places them on the same activation route as the other components. The blend supplies a fixed proportion of the extract. Adding a separate ashwagandha product changes that ratio.

Bacosides are triterpenoid saponins studied for antioxidant enzyme activity in nervous tissue. In this blend Bacopa contributes to the polyphenol and saponin load rather than acting as a separate stack layer. Duplicating it with a standalone product shifts the ratio the blend was built to.

Resveratrol has been shown in cell systems to raise Nrf2-driven transcription of antioxidant enzymes, the same readout used to characterise this blend. It is not part of the blend itself, so it adds rather than duplicates. Its oral bioavailability is low because of rapid glucuronidation and sulfation.

Ubiquinol acts directly as a membrane antioxidant and as an electron carrier, which is a different layer from inducing antioxidant enzyme transcription. Pairing a direct scavenger with an enzyme inducer covers two mechanisms rather than one twice. Absorption of CoQ10 requires dietary fat.

Alpha-tocopherol stops lipid peroxidation chains in membranes while the enzymes induced through Nrf2 handle peroxides in the cytosol. The two act in different compartments. Very high antioxidant intakes have been questioned for blunting normal exercise adaptation signals, so total load is worth counting.

Ascorbate regenerates alpha-tocopherol at the membrane interface and supports the reduced state of cellular thiol pools. Nrf2 activation raises the enzymes that use glutathione; ascorbate helps keep the substrate reduced. The pairing is standard redox biochemistry.

Astaxanthin spans the lipid bilayer with polar ends at both surfaces, so it quenches radicals at the membrane boundary rather than only in the core. That is a direct scavenging role, separate from transcriptional induction. It needs dietary fat for absorption.

Quercetin oxidises to a quinone that can modify Keap1 cysteines and it also chelates redox-active iron, removing a Fenton catalyst. Both routes point the same way as the blend. Its own absorption is modest and depends on the glycoside form supplied.

Catechins, curcumin and other polyphenols form insoluble complexes with non-heme iron in the intestine, which reduces iron absorption from the same meal. A polyphenol-heavy blend taken with an iron supplement lowers what is absorbed from both directions. Separating the two by a couple of hours is the usual practical answer.

The catechol and galloyl groups that make these botanicals reactive also bind divalent metals, including zinc, in the gut lumen. The effect is smaller than for iron but points the same way. Spacing the doses avoids the question.

Ubiquinol donates electrons to lipid peroxyl radicals inside membranes and can regenerate tocopherol, which places it alongside rather than downstream of an enzyme-inducing blend. It is the form already reduced, so it does not depend on cellular reductases for its antioxidant role. Fat is needed for absorption.

Every antioxidant enzyme induced through this route ultimately draws on NADPH, which is built from the nicotinamide nucleotide pool. Niacin and its amide forms supply the precursor for that pool. Inducing the enzymes without the reducing equivalents to run them is an incomplete stack.